Seleucus I Nicator child Antiochus I Soter
Seleucus I Nicator (; c. 358 – 281 BC; Greek: Σέλευκος Νικάτωρ Séleukos Nikátōr Attic Greek pronunciation: [sé.leu̯.kos], lit. 'the Victorious') was a Macedonian Greek general, officer and successor of Alexander the Great. While serving under Alexander, Seleucus was commander of the Hypaspistai, or Silver-Shields, an elite Macedonian infantry unit, and eventually went on to become the founder and king of the eponymous Seleucid Empire. In the power struggles that followed Alexander's death, Seleucus rose from being a secondary player to becoming total ruler of Asia Minor, Syria, Mesopotamia, and the Iranian Plateau, eventually assuming the title of basileus (king). This Seleucid Empire was one of the major powers of the Hellenistic world, until being overcome by the Roman Republic and Parthian Empire in the late second and early first centuries BC.
After the death of Alexander in June 323 BC, Seleucus initially supported Perdiccas, the regent of Alexander's empire, and was appointed Commander of the Companions and chiliarch at the Partition of Babylon in 323 BC. However, after the outbreak of the Wars of the Diadochi in 322, Perdiccas' military failures against Ptolemy in Egypt led to the mutiny of his troops in Pelusium. Perdiccas was betrayed and assassinated in a conspiracy by Seleucus, Peithon and Antigenes in Pelusium sometime in either 321 or 320 BC. At the Partition of Triparadisus in 321 BC, Seleucus was appointed Satrap of Babylon under the new regent Antipater. But almost immediately, the wars between the Diadochi resumed and one of the most powerful of the Diadochi, Antigonus, forced Seleucus to flee Babylon. Seleucus was only able to return to Babylon in 312 BC with the support of Ptolemy. From 312 BC, Seleucus ruthlessly expanded his dominions and eventually conquered the Persian and Median lands. Seleucus ruled not only Babylonia, but the entire eastern part of Alexander's empire.
Seleucus further made claim to the former satrapies in Gandhara and in eastern India. However these ambitions were contested by Chandragupta Maurya, resulting in the Seleucid–Mauryan War (305–303 BC). The conflict was ultimately resolved by a treaty resulting in the Maurya Empire annexing the eastern satrapies. Additionally, a marriage alliance was formed, with Chandragupta marrying a daughter of Seleucus, according to Strabo and Appian. Furthermore, the Seleucid Empire received a considerable military force of 500 war elephants with mahouts, which would play a decisive role against Antigonus at the Battle of Ipsus in 301 BC. In 281 BC, he also defeated Lysimachus at the Battle of Corupedium, adding Asia Minor to his empire. 
Seleucus' victories against Antigonus and Lysimachus left the Seleucid dynasty virtually unopposed amongst the Diadochi. However, Seleucus also hoped to take control of Lysimachus' European territories, primarily Thrace and Macedon itself. But upon arriving in Thrace in 281 BC, Seleucus was assassinated by Ptolemy Ceraunus, who had taken refuge at the Seleucid court with his sister Lysandra. The assassination of Seleucus destroyed Seleucid prospects in Thrace and Macedon, and paved the way for Ptolemy Ceraunus to absorb much of Lysimachus' former power in Macedon. Seleucus was succeeded by his son Antiochus I as ruler of the Seleucid Empire.
Seleucus founded a number of new cities during his reign, including Antioch (300 BC), Edessa and Seleucia on the Tigris (c. 305 BC), a foundation that eventually depopulated Babylon.Youth and family
Seleucus was the son of Antiochus. Historian Junianus Justinus claims that Antiochus was one of Philip II of Macedon's generals, but no such general is mentioned in any other sources, and nothing is known of his supposed career under Philip. It is possible that Antiochus was a member of an upper Macedonian noble family. Seleucus' mother was supposedly called Laodice, but nothing else is known of her. Later, Seleucus named a number of cities after his parents. Seleucus was born in Europus, located in the northern part of Macedonia. Just a year before his birth (if the year 358 BC is accepted as the most likely date), the Paeonians invaded the region. Philip defeated the invaders and only a few years later utterly subdued them under Macedonian rule. Seleucus' year of birth is unclear. Justin claims he was 77 years old during the battle of Corupedium, which would place his year of birth at 358 BC. Appian tells us Seleucus was 73 years old during the battle, which means 354 BC would be the year of birth. Eusebius of Caesarea, however, mentions the age of 75, and thus the year 356 BC, making Seleucus the same age as Alexander the Great. This is most likely propaganda on Seleucus' part to make him seem comparable to Alexander.As a teenager, Seleucus was chosen to serve as the king's page (pais). It was customary for all male offspring of noble families to first serve in this position and later as officers in the king's army.A number of legends, similar to those told of Alexander the Great, were told of Seleucus. It was said Antiochus told his son before he left to battle the Persians with Alexander that his real father was actually the god Apollo. The god had left a ring with a picture of an anchor as a gift to Laodice. Seleucus had a birthmark shaped like an anchor. It was told that Seleucus' sons and grandsons also had similar birthmarks. The story is similar to the one told about Alexander. Most likely the story is propaganda invented to present Seleucus as the natural successor of Alexander.John Malalas tells us Seleucus had a sister called Didymeia, who had sons called Nicanor and Nicomedes. It is most likely the sons are fictitious. Didymeia might refer to the oracle of Apollo in Didyma near Miletus. It has also been suggested that Ptolemy (son of Seleucus) was actually the uncle of Seleucus.Seleucia
The next event connected to Seleucus was the founding of the city of Seleucia. The city was built on the shore of the Tigris probably in 307 or 305 BC. Seleucus made Seleucia his new capital, thus imitating Lysimachus, Cassander and Antigonus, all of whom had named cities after themselves. Seleucus also transferred the mint of Babylon to his new city. Babylon was soon left in the shadow of Seleucia, and the story goes that Antiochus, the son of Seleucus, moved the whole population of Babylon to his father's namesake capital in 275 BC. The city flourished until AD 165, when the Romans destroyed it.A story of the founding of the city goes as follows: Seleucus asked the Babylonian priests which day would be best to found the city. The priest calculated the day, but, wanting the founding to fail, told Seleucus a different date. The plot failed however, because when the correct day came, Seleucus' soldiers spontaneously started building the city. When questioned, the priests admitted their deed.Defeat of Demetrius and Lysimachus
Seleucus nominated his son Antiochus I as his co-ruler and viceroy of the eastern provinces in 292 BC, the vast extent of the empire seeming to require a double government. In 294 BC Stratonice married her stepson Antiochus. Seleucus reportedly instigated the marriage after discovering that his son was in danger of dying of love sickness. Seleucus was thus able to get Stratonice out of the way, as her father Demetrius had now become king of Macedonia.
The alliance between Seleucus and Demetrius ended in 294 BC when Seleucus conquered Cilicia. Demetrius invaded and easily conquered Cilicia in 286 BC, which meant that Demetrius was now threatening the most important regions of Seleucus' empire in Syria. Demetrius' troops, however, were tired and had not received their payment. Seleucus, on the other hand, was known as a cunning and rich leader who had earned the adoration of his soldiers. Seleucus blocked the roads leading south from Cilicia and urged Demetrius' troops to join his side. Simultaneously he tried to evade battle with Demetrius. Finally, Seleucus addressed Demetrius personally. He showed himself in front of the soldiers and removed his helmet, revealing his identity. Demetrius' troops now started to abandon their leader en masse. Demetrius was finally imprisoned in Apameia and died a few years later in captivity.Lysimachus and Ptolemy had supported Seleucus against Demetrius, but after the latter's defeat the alliance started to break apart. Lysimachus ruled Macedonia, Thracia and Asia Minor. He also had problems with his family. Lysimachus executed his son Agathocles, whose wife Lysandra escaped to Babylon to Seleucus.The unpopularity of Lysimachus after the murder of Agathocles gave Seleucus an opportunity to remove his last rival. His intervention in the west was solicited by Ptolemy Keraunos, who, on the accession to the Egyptian throne of his brother Ptolemy II (285 BC), had at first taken refuge with Lysimachus and then with Seleucus. Seleucus then invaded Asia Minor and defeated his rival in the Battle of Corupedium in Lydia, 281 BC. Lysimachus fell in battle. In addition, Ptolemy had died a few years earlier. Seleucus was thus now the only living contemporary of Alexander.
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