Love (Harry Potter)

Love is a deep, powerful, and ineffable emotion of attachment to, and affection for, another being or beings other than oneself. It gives those who experience it the ability to do very great things as a result of it. 
Harry Potter in particular had such great love for his friends that he decided to sacrifice himself to Voldemort. This sacrifice conferred Harry's allies a certain amount of protection, thus the spells Voldemort tried to place on them wouldn't hold. Someone full of hate (such as Voldemort himself, Tom Riddle), who had never known love couldn't begin to understand its full magical properties. 
Love was one of the hardest and strongest kinds of magic and as such, provided the only defence for the Killing Curse. Love was also quite possibly the most mysterious branch of magic and was extremely difficult to comprehend. There was a room devoted to the study of it in the Department of Mysteries.
==History==
===11th century===
The Bloody Baron had fallen in love with Helena Ravenclaw, but she did not reciprocate and rejected his many advances, the last rejection leading to his impulsively killing her, then killing himself out of regret. Throughout Helena's life, she never found true love due to never having found a man worthy of her standards.
Rowena Ravenclaw loved her daughter Helena greatly, as she never revealed her daughter's betrayal and desertion to others, and fell fatally ill from what legends describe as a "broken heart". Even in her deathbed, Rowena disregarded Helena's betrayal and her last wish was to simply see her daughter one more time.
===12th century===
Cadmus Peverell fell in love with a woman, but she died of unknown causes before the two could be wed. After either creating or been given the Resurrection Stone by Death, he used it in an attempt to bring his late lover back to him, but this "revival" was incomplete and she was always sad and cold, giving off the feeling of the two were still separated.
Cadmus was driven mad by being unable to be with his love in this life, so he committed suicide by hanging himself from rafters to be truly reunited with her in the next life.
===17th century===
Around 1634, Gormlaith Gaunt tracked down Isolt Sayre (her niece who had escaped her) and placed her and her husband, the Muggle James Steward, under a powerful curse that kept them in a deep sleep. Though it seemed nothing could wake them, the screams of their daughters broke through the enchantment, as they loved their daughters very deeply.
Also during this time, Webster Boot fell in love with a Scottish witch and the two married, settled in Britain, and had children together. Webster’s descendants would be educated at Hogwarts School of Witchcraft and Wizardry, such as descendant Terry Boot.
===1890s===
In 1899, Albus Dumbledore's love for his brother and sister pushed him to turn against his new friend and lover Gellert Grindelwald and attack him, finally defeating him in 1945.
===1910s===
In 1913, Newt Scamander, out of love for Leta Lestrange, took the blame for one of her experiments. This experiment involved a Jarvey and it went wrong, endangering the life of another student. Rather than see his good friend expelled, Newt took the blame and was expelled from Hogwarts in her place. This left him slightly bitter, but still much in love with Leta.
===1920s===
In 1925, Merope Gaunt had developed an attraction with Tom Riddle Snr, and betrayed her family's beliefs in blood purity to be with the man she desired. Riddle, however, was not interested in her, and thus she either controlled him with the Imperius Curse or gave him a Love Potion, the latter more likely, thereby forcing him to marry her. After she fell pregnant, she stopped dosing Riddle with Love Potions, thinking that he would finally love her in return or at least stay to help raise their child. 
However, after regaining his free will, Riddle fled from Merope and returned to his family. Realising the abandonment is the confirmation that Riddle did not love her made Merope lose her will to live, to the point that she would not (or could not) perform magic any further. Her son, also named Tom Riddle, was unable to feel love for anyone partly due to his parents not truly loving each other.
In 1927, Leta Lestrange sacrificed herself in an attempt to fight against Gellert Grindelwald in order to protect Newt and Theseus, whom she both loved dearly as she declared moments before she died. Leta's death profoundly devastated the brothers, enraging Theseus, who was going to marry her, and prompting Newton to get more involved in the war against Grindelwald in order to avenge Leta's demise.
Queenie Goldstein, who was deeply in love with the No-Maj Jacob Kowalski, enchanted him so that he would accept to marry her. Indeed, although Jacob really did love Queenie as well, he refused to marry her since it could cause her to be sent into prison due to the laws preventing Wizards from marrying No-Majs. Once the enchantment was lifted by Newton Scamander, Queenie, in a drastic and desperate attempt to be able to freely live with Jacob, joined the ranks of Gellert Grindelwald's army, believing that Gellert Grindelwald would tear down the old system and allow her to be with Jacob. Jacob, however, refused to follow her on that path.
===1970s===
During the early 1970s, Severus Snape met Lily Evans and fell deeply in love with her as a child, becoming a close friend of hers. Over the course of their school years at Hogwarts, his love for only continued to grow stronger, with Snape sinking into incandescent jealousy when he learnt that his archenemy James Potter had feelings for Lily in their fifth year. Despite ending her friendship with him later on, however, Snape continued to feel nothing but deep, unconditional love for Lily until the end of his life.
Around 1977, James Potter himself, who was very mischievous, was truly in love with Lily to the point where it changed his character a little by the fact that he stopped hexing people just for fun.
Bellatrix may have married Rodolphus Lestrange out of obligation for her family's beliefs, but her true love is Lord Voldemort. Voldemort, on the other hand, did not reciprocate, as he cannot understand love due to his upbringing, although he does value Bellatrix's talents and loyalty. Unlike their eldest sister, Andromeda and Narcissa married their respective spouses out of love and in Andromeda's case went against her family's beliefs, which led her to be disinherited.
===1980s===
In 1981, Severus Snape's love for Lily Evans pushed him to join the Order of the Phoenix, even though he hated her husband, and then Snape desperately begged Lord Voldemort to promise to spare her when he went to murder her infant son Harry Potter.
In that same year on Hallowe'en, James' love for his wife and son caused him to stand face to face with the darkest wizard in a century (Lord Voldemort) on his own in an effort to give them time to escape. Also in the same night, Lily's love for her son Harry protected him from Lord Voldemort. He became the only known person in history to survive the Killing Curse, because of the power of Lily's loving sacrifice. However, it could be that while love was the motive, the cause of Harry's protection was that Lily had lured Voldemort into a binding magical contract so that having killed her, he would be unable to kill Harry, because he had already promised to spare Lily, and only her offer allowed him to kill her. 
Sirius Black's grief over James and Lily's deaths made him track down Peter Pettigrew and attempt to kill him in retaliation after realising he betrayed James and Lily to Voldemort, an act which resulted in his 12-year imprisonment in Azkaban after Pettigrew faked his own death and framed him for his crimes. Most notably, however, Lily's death would leave Snape phenomenally devastated, causing him to suffer terrible remorse for his unintentional part in her demise, but, in turn, it would drive him to officially join the Order of the Phoenix as a double agent and spy on the Death Eaters at Dumbledore's behest, so as to protect Harry in anticipation of Voldemort's return and to ultimately defeat the most dangerous Dark wizard of all time, with his change in allegiances also gradually turning Snape into a better man.
Also, on Hallowe'en in 1981 (after travelling back in time), Ginny Potter's love for her husband was shown when she argued against Harry being the one to disguise himself as Voldemort in an attempt to lure Delphi into a trap. She even offered to be the one disguised instead, but eventually conceded as both her and Harry agreed that it must be him, seeing as it was the only way. Ginny was also unable to bear looking at Harry when he was wearing Voldemort's form, as it hurt her to see the man she loved dearly disguised as the man both she and Harry hated.
On the same night, the love that Albus Potter felt for his father Harry caused him to risk his own life in order to save him from Delphi, during the latter's duel in a church. This love was returned when Harry jumps in front of his son when a Killing Curse is aimed at him. Harry is later found after the confrontation to be furious at Delphi for attempting to murder his child.
The Weasley family was not wealthy at all, compared to other wizarding families. Many other pure-blood families, particularly the Malfoys, disdained them for their "blood traitor" beliefs and lack of wealth. Molly and Arthur tried their best to make up for this by sustaining their children with their love.
After Barty Crouch Jnr was imprisoned in Azkaban, his mother persuaded his father to help break him out. Crouch Snr agreed out of love for his wife and some love for his son, even though his neglect of Barty Jnr for his Ministry duty and public image made his son claim he never loved him at the very least. Winky the house-elf, who also loved Barty Jnr, cared for him with a sense of motherly affections, though Barty believed that it was pity and duty. He instead let their sacrifices be in vain by returning to the Dark Arts, and as a result, suffered the Dementor's Kiss.
Throughout the decade, the love Jacob's sibling felt for their brother caused them to obsessively seek out the Cursed Vaults. The platonic love between them, Rowan Khanna, Penny Haywood, and Ben Copper along with friends they would make throughout their education would make this quest possible.
During the 1988–1989 school year, after the Portrait curse trapped Beatrice Haywood, her older sister, Penny Haywood, spent every moment she could trying to free her; in the next year after she was freed, the sister came into conflict as Beatrice wanted more space and made friends with the often considered disreputable Ismelda Murk, while Penny wished that Beatrice could be back to her old cheerful self and they could be close again. However, after Jacob's sibling asked Penny to help brew a Love potion for an unrelated matter, Penny reflected on the nature of love and realised she could not change her sister and that the best way to express her love for her is respect her wishes. As a friend to both Penny and Beatrice, Jacob's sibling would discuss and contrast the love and strife within the relationships they have with their once-close siblings multiple times.
During the 1989–1990 school year at Hogwarts School of Witchcraft and Wizardry, Rowan Khanna's love for their friends caused them to intercept the Killing Curse aimed at Ben Copper by the Dark witch Patricia Rakepick and selflessly sacrifice their own life for him. Their heroic death would inspire Jacob's sibling, Ben Copper and Merula Snyde to establish the Circle of Khanna in honour of them.
====1991–1992====
On 4 June 1992, because of the protection that Lily Potter's loving sacrifice created for Harry Potter Professor Quirinus Quirrell could not touch Harry without serious harm to his physical well-being, his body started to burn when he came into contact with Harry's skin. In doing so, this led to Professor Quirinus Quirrell's death and Voldemort was once again without a body to possess and was unable to return to power without a corporeal form of his own, bringing him back to being less than a ghost, Lily's love for Harry pushing back his return.
====1992–1993====
Some time around 31 July 1992, Ginny Weasley's romantic feelings for Harry drove her into hiding in his presence during his first visit to the Burrow. She later stood up for him against Draco Malfoy at the risk of being chosen among the Weasley children for Lucius Malfoy to plant Tom Riddle's Diary upon. Her love also prompted her to send Harry a Valentine's Day card, and later attempt to reveal to him and Ron that she was responsible for opening the Chamber of Secrets.
On 29 May 1993, the love Harry and Ron had for Ginny, Harry's future wife and Ron's sister, caused them to go to the Chamber of Secrets to rescue her from the Basilisk and the Heir of Slytherin, Harry also stated that it was the worst day of his life. Harry's love for Ginny also caused him to panic when he saw her unmoving form laying on the Chamber floor, scared that she might have been dead.
It is also revealed that after the events in the Chamber of Secrets, people shut Ginny out of their lives, but Harry came to her and played a game of Exploding Snap. Although Harry did not have romantic feelings for Ginny at the time, Ginny claimed that she felt specific love from Harry since that day and that his love for her always made her feel stronger.
====1993–1994====
Some time around 31 July, 1993, Sirius Black's protective feelings for Harry drove him into escaping from Azkaban unaided after learning Peter Pettigrew was in the possession of the Weasley family and potentially a threat to Harry. His affection for Harry also led him to Privet Drive in order to catch a glimpse of him. Sirius even ventured out into a rainstorm in order to watch Harry play Seeker during a Quidditch match.
On 6 June 1994, Remus Lupin's love for Sirius made him believe of Sirius's innocence immediately after discovering Pettigrew was still alive, despite initially believing Sirius was the traitor and then reveal the truth to Harry, Ron and Hermione. Remus' love for Sirius also led to him preventing Harry from causing any more harm to him, as Harry was previously debating killing Black.
The love Harry Potter felt for his godfather Sirius after discovering his innocence caused him and his other best friend Hermoine Granger to head back in time via a Time-Turner to rescue him from the Dementors. The prospect of living with him instead of the Dursleys gave him a powerful and happy enough memory to conjure a incredibly powerful corporal Patronus that drove away hundreds of Dementors, thus saving his past self, the past Hermione, and Sirius from the Dementor's Kiss.
====1994–1995====
Sirius Black's love for Harry caused him to put his own safety in jeopardy when he journeyed to Hogsmeade in order to visit Harry during his stint as Triwizard champion. Sirius spent this period in time living in a cave and eating rats as a source of food. Sirius's love for Harry also caused him to risk exposure in several other instances as well, such as contacting Harry while he was in the Gryffindor common room.
Fleur Delacour's love for her little sister Gabrielle was what lead to Gabrielle being taken into the lake as the thing Fleur would sorely miss during the Second Task of the Triwizard Tournament. During the Task, Fleur was attacked by Grindylows and was forced to retreat. Unaware that the hostages were not in any real danger, she was quite hysterical. She fought so hard to return to the water that even half-giant Madame Maxime had difficulty restraining her.
On 20 May 1995, the love Dave and Tilly Monk felt for their fledgling newborn children caused them to provide them immediate medical care through an "amazing" neonatal team. The twins were quickly taken to the Neonatal Intensive Care Unit, where they were kept in incubators, receiving vital fluids through intravenous lines and breathing with the help of mechanical ventilators. Five days after his birth, Tom's condition was stable enough for Tilly to hold him in her arms for the first time, which gave her a "huge boost." Dave was also over the moon and wrote an article about their miraculous birth, which was featured on the front page of the 12 August, 1995 issue of Metro, under the title "Miracle babies make it".
On 24 June 1995, Harry managed to escape from the Little Hangleton graveyard and Lord Voldemort when the echoes of some of his loved ones came to his aid through the effect of Priori Incantatem. This was the first time Harry communicated with his parents in some form. Later that night, when Amos Diggory spotted the deceased Cedric's body, the love he had for his son caused him to break down in grief and let out an cry of anguish.
====1995–1996====
Molly Weasley's love for Harry lead her to be overprotective of him and it angered her that Sirius Black and Remus Lupin went against her wishes and gave Harry the general picture of what the Order was doing in the fight against Voldemort. This in turn lead to an intense row between Molly and Sirius involving Harry's welfare. Also the form of Molly's boggart, which reflected her greatest fear of seeing her family dead by appearing as their dead bodies, included Harry's own corpse. In return Harry saw her as the mother he never had, because she gave him the love and protection he needed and wanted.
In 1996, Rubeus Hagrid's love for his giant half brother Grawp made him bring Grawp with him back to Hogwarts after learning of the bullying he received from the other giants due to his smaller size and presumably to protect him from Voldemort's enslavement of the giants. This was done despite Grawp attempting to remain with the giant colony and attacking Hagrid as a result, and concerns that his attempts to earn Grawp's trust were fruitless. The concern which Harry, Ron, and Hermione had for their friends after Voldemort's return made them form Dumbledore's Army to oppose Dolores Umbridge and teach practical defence against Voldemort, when Umbridge refused to teach defensive magic.
The love Harry, Ron, and Hermione had for Sirius Black made them go to the Ministry of Magic in a vain attempt to rescue him from Voldemort, unaware it was a false vision Voldemort planted on Harry. On the other hand, the loyalty which Neville Longbottom, Luna Lovegood, and Ginny Weasley had for Harry, Ron, and Hermione made them accompany the trio to the Ministry. Sirius's love for Harry in turn made him leave the protection of his house to rescue Harry and his friends from Voldemort's Death Eaters at the cost of his own life, despite Dumbledore's order for him to remain in his house for his own safety. Remus Lupin's love for Harry made him restrain Harry from running through the veil after Sirius's death, despite being devastated over losing his last surviving Marauder friend.
Harry's love for his parents and Sirius again helped him, when his grief over their deaths overcame Voldemort's attempt to possess him and forced him out of his mind. Voldemort couldn't stand to be exposed to the emotions Harry felt and couldn't maintain control over him and left his person.
In that same year, Dumbledore ignored Harry, thinking that this would prevent Voldemort from using the connection with Harry Potter to gain insight into his own mind because Voldemort would sense he cared "too much" about Harry and would be eager to use their relationship to gain access to Dumbledore's mind and knowledge of the activities of the Order of the Phoenix.
====1996–1997====
In 1997, it is revealed that the pain inflicted upon Voldemort when Harry forced him out of his mind scared him away from attempting the same tactic again. The time Harry and Ginny Weasley spent together in the Burrow along with Ginny opening herself up more to him finally made Harry mutually return her romantic feelings for him, to the point that he became jealous of her temporary relationship with Dean Thomas. Their mutual love later lead to their first kiss when he entered into the common room after the Quidditch match that took place during his detention with Professor Snape. It also drove him to leave her in fear of her being a target of Lord Voldemort and end their direct relationship in order to protect her. Ginny's love for Harry led her to declare that she did not care what kind of danger she would be in, because to her it would be worth the risk.
In that same year, Harry's love for Professor Albus Dumbledore and grief over his death pushed him to attack Severus Snape with one of his own spells. He did this even though Snape was a more experienced dueller and had extensive knowledge of the Dark Arts. Draco Malfoy's love for his family pushed him to attempt to murder Dumbledore, even though he really did not want to in order to spare his parents and himself from Voldemort's wrath, when he decided to use Draco in order to punish Lucius for his failure to retrieve the prophecy, believing that Draco would fail his mission. This also made Narcissa approach Severus Snape out of love for her son and make him do an Unbreakable Vow so that he would kill Dumbledore himself and ensure Draco's protection if he failed his mission, which eventually happened towards the end of the year.
Fleur Delacour asserted her love for Bill Weasley even after he was horribly scarred in battle by Fenrir Greyback, stating that she did not care how he looked and that all the scars proved was that Bill was brave. Her declarations prompted Tonks to once again impress upon Remus Lupin she did not care about his being a full werewolf, older than her, or that he was poor and that she loved and wanted to be with him anyway.
====1997–1998====
For Harry's seventeenth birthday, Molly's love for him caused her to gave him a watch that had belonged to her brother Fabian Prewett. In the middle of explaining the watch-giving tradition, Molly's speech was interrupted by a hug from Harry with which he hoped to convey his deep feelings of gratitude and care, which worked; Molly was taken-aback, but very touched.
During Harry's stay The Burrow before his hunt for Horcruxes, his love for Ginny motivated him to stay away from her, as anyone he came in contact with was a target of Voldemort. In return, Ginny's love for Harry motivated her to insure that he remembered her while on his Horcrux hunt, by kissing him as she had never done so before. Also, the knowledge that Harry was leaving for an indiscriminate amount time and the fact that she did not know when she would see him next, finally brought her to tears.
Their love and caring for Harry motivated Hermione Granger and Ron Weasley to accompany him on the Horcrux hunt, leaving their families and risking their lives. When Harry, Ron, and Hermione were taken to Malfoy Manor, Ron begged and pleaded with Bellatrix to interrogate him instead of Hermione, because he deeply loved her. The love and loyalty which Neville Longbottom, Luna Lovegood, and Ginny Weasley had for Harry, Ron and Hermione motivated them to reform Dumbledore's Army and oppose both the Carrow's and spy on Severus Snape during Voldemort's control of Hogwarts. Xenophilius Lovegood's love for his daughter Luna drove him to abandon his public support of Harry and caused him to attempt to turn him, Ron, and Hermione over to the Death Eaters in order to get Luna back when she was abducted by them.
During the Battle of Hogwarts, Lucius and Narcissa Malfoy's love for their son motivated them to look for him and desert Voldemort instead of fighting. Molly Weasley's love for her daughter Ginny made her face Bellatrix Lestrange herself and said that no student should help her. The battle also marked the moment Ron and Hermione officially started their romantic relationship, sharing their first kiss after Ron showed concern for the safety of the Hogwarts house-elves, with their feelings for each other having grown over the past few years.
In the forest before Harry confronted Voldemort, he used the Resurrection Stone to bring back his loved ones. He was immediately joined by the shades of his parents, Sirius Black, and Remus Lupin. Both James' and Lily's spirits had "loving smiles on their faces", Lily's smile was widest of all and her spirit was described as looking at Harry as if she couldn't do so enough. Lily and James also told their son that they were tremendously proud of him, for being so brave and strong despite all the suffering and pain that he had been forced to endure. The presence of his loved ones was enough to give Harry the courage to keep going, and they remained with him until he made his way to where Voldemort was. At this point, Harry discarded the Stone, with the intention that it would be lost in the forest forever.
In the end, Harry's love for his friends caused him to sacrifice himself to Voldemort. This conferred a certain amount of protection on Harry's allies, making it so that the spells Voldemort tried to place on them, including Silencing Charms and a Full Body-Bind Curse quickly wore off. This love was what made Harry different from Voldemort. He had something worth fighting for while Voldemort could never understand the power of love. Harry's love for people even made him offer Voldemort a final chance of redemption.
Harry Potter's love for Ginny Weasley (his future wife) made her the last person he thought about before facing his own death. Also when it seemed that Harry had been murdered by Voldemort, Ginny was beyond heartbroken and screamed louder than anyone else, alongside Ron and Hermione. The supposed death of her one love was enough to drive her to attack the incredibly powerful Bellatrix Lestrange alongside Luna, and Hermione. Minerva McGonagall's love and concern for Harry made her grief and reaction over Harry's supposed death rival that of Ron, Hermione, and Ginny, and push her to duel Voldemort head on alongside Horace Slughorn and Kingsley Shacklebolt.
Neville's strong loyalty and friendship for Harry gave him the courage to stand up to Voldemort himself, refuse his offer to join him as a Death Eater, and then destroy his last remaining Horcrux, Nagini, to render Voldemort mortal, even when it seemed all was lost with Harry's supposed death. This strong display of courage by Neville was what enabled Harry to defeat Voldemort for the final time and end the Second Wizarding War.
==Nature==
There was a difference between true love and a simple, short-term infatuation, such as a crush. Harry Potter developed a crush on Cho Chang and their relationship broke apart from various misunderstandings and quarrels. Harry eventually lost interest in Cho altogether though he remained friends with her. Ginny Weasley had a crush on Harry since she was 11 which prompted her to send him a love letter on Valentine's day. This crush slowly turned to love. True love had the power to change the form a Patronus takes, as it can change a person's character (as seen with Lily and James Potter) as proven with Nymphadora Tonks when she fell in love with Remus Lupin.
There was also a difference between true love and obsession as true love meant someone doing everything for their beloved's happiness. On the other hand, obsessive love meant desperately attempting to be loved even though their true loves did not reciprocate their love, either through enchanting their lovers, or doing dangerous acts to please their lovers. This was the case with Merope Riddle for Tom Riddle, and Bellatrix Lestrange for Voldemort.
Love was also an incredibly dangerous emotion. It caused people to act in extreme ways, both bad and good. For example it gave Harry Potter and Lily Potter the strength needed to sacrifice themselves and gave Neville Longbottom the courage required to stand up to Lord Voldemort. It was also a motivator that drove Bellatrix Lestrange to commit all the heinous acts she had performed over the years. Bellatrix did this in the name of her obsessive love for the Dark Lord. 
It also caused foolishness in Dumbledore, when he momentarily forgot that Marvolo Gaunt's ring containing the Resurrection Stone was a Horcrux. In his haste to see his deceased loved ones again he put the ring on, this caused him to become infected with a lethal curse. Although Bartemius Crouch Junior's mother meant well when she rescued her beloved son from a life-sentence in Azkaban, she effectively released a mentally unstable, psychopathic criminal who would go onto commit patricide and assist Lord Voldemort's revival that plunged the world into the Second Wizarding War.
Other dangers of love were that it made Sirius Black act more recklessly and violently in his desperation to protect Harry from Peter Pettigrew after escaping Azkaban, and pushed Draco Malfoy to attempt to kill Dumbledore while attempting to spare his parents and himself from Voldemort's wrath. This was also shown when Voldemort, in his mission to uncover the prophecy, took advantage of Harry's love for Sirius by planting a false vision of him torturing Sirius in Harry's mind, making Harry and his friends go to the Department of Mysteries in a vain attempt to rescue him, without realising it was a trap. These dangerous aspects of love were the main reason why the Love Room within the Department of Mysteries was always locked.
==Love and magic==
Love had an incredibly profound effect on magic. Lily Potter's love for her son made her willing to die for him. Because of her loving sacrifice, Harry Potter was protected from very powerful dark magic — the Killing Curse. This protection was later strengthened when Voldemort arrogantly used Harry's blood to reinvigorate his body, to the point that Harry could not be killed while Voldemort was still alive, making it possible for Harry to survive another hit from the Killing Curse, when he found out when he was one of Voldemort's Horcruxes. By doing the same thing as his mother did, everyone that Harry sacrificed for was shielded from Voldemort.
Love was the only protection against the lure and power of the Dark Arts, which came from hateful and spiteful emotions. Harry failed to learn Occlumency in order to block his connection to Lord Voldemort's mind, but he managed to block the link when he focused on his feelings for his loved ones, such as when he felt grief over his godfather's death, and when he was frantically worried about Hermione Granger when she was being brutally tortured by Bellatrix Lestrange. Those who were filled with hate, such as Tom Riddle and Quirinus Quirrell, could be inflicted great pain and even death by the power of love.
Love could also affect other types of magic, notably the Patronus. Harry's Patronus was the same as the Patronus and Animagus form of his father's, a stag. James's wife, Lily Evans, had a doe Patronus to match her husband's stag, which may have possibly been the same for Harry's wife, Ginny Weasley, to match her husband's as well, changing it from a horse. Severus Snape's mimicked Lily's doe Patronus because of his love for her. Nymphadora Tonks's Patronus changed to a wolf when she fell in love with Remus Lupin. Love could also enhance the power of a Patronus, as Harry's love for Sirius made him produce a Patronus so powerful that it could drive hundreds of Dementors away.
Love Potions and Entrancing Enchantments were meant to artificially create love, but they couldn't; nothing could reproduce real love. Instead, they could at most produce an intense infatuation or obsession. Should these powers become undone, the victim would most likely lose all infatuation for the caster, and even become embarrassed or horrified, as Ron Weasley and Tom Riddle Snr both experienced once the love potion they were administered were cancelled, the latter even fleeing without a hint of care for the one who tried to captivate him. When a person smelt Amortentia, they would smell things that reminded them of what and whom they loved. Within the Love Room of the Department of Mysteries was where love was studied, and a large fountain of Amortentia was kept. This fountain was the centre of the room and the Amortentia within it was very powerful.
It appeared that those who abused the power of love, or applied it for the sake of those who had an affinity for the Dark Arts, usually suffered some severe backlash, based on the First Law of the Fundamental Laws of Magic. A prime example was seen when Merope Gaunt used enchantments to subjugate the man she genuinely loved. This subjugation led to her being abandoned and left to die in despair (along with her magical powers being drained from the sorrow), when she lifted the control off her besotted. 
She later gave birth to a loveless being who would create a campaign of hatred for many decades, and would eventually be left to suffer a terrible after-death, due to his lack of understanding of love. Also, despite Mrs Crouch and Winky truly loving Barty Crouch Jnr and making much selfless sacrifices for his sake, he was utterly ungrateful and instead wasted their efforts. Since he abused their affections and returned to the Dark Arts, he suffered a fate worse than death.
==Love in literature==
Amata in The Fountain of Fair Fortune fell in love with a Muggle named Sir Luckless.
The Warlock in The Warlock's Hairy Heart regarded love as a sickness and used the Dark Arts to prevent it from happening to him, which led to him paying dearly for it.
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Category:Laws Of-Real Magic
Category:Love Known-Real Magic