Alexei Petrovich, Tsarevich of Russia
Alexei Petrovich of Russia (28 February 1690 – 7 July 1718) was a Russian Tsarevich.
He was born in Moscow, the son of Tsar Peter I and his first wife, Eudoxia Lopukhina.
Alexei despised his father and repeatedly thwarted Peter's plans to raise him as successor to the throne.
His brief defection to Austria scandalized the Russian government, leading to harsh repressions against Alexei and his associates.
Alexei died after interrogation under torture, and his son Peter Alexeyevich became the new heir apparent.
Alexei Aidarov
Alexei Petrovich Aidarov( born 15 November 1974) is a Russian- born former Belarusian( until 2006) and Ukrainian( since 2007) biathlete.
Alexander Kikin
Alexander Vasilievich Kikin( Александр Васильеви ч Кикин; ca. 1670- 1718) was a political mentor and advisor to Alexei Petrovich, Tsarevich of Russia; accused of having arranged the flight abroad of the latter, Kikin was broken on the wheel.
Kikin began his career as a bombardier in the toy army of Peter I.
He accompanied the monarch in the Great Embassy and learned the mast- maker's craft in the Netherlands.
Upon returning to Russia, Kikin helped build the first Russian warships in Voronezh and Olonets.
In the January campaign of 1706 he had Mitau Castle blown up and retreated with his regiment toward Minsk.
In 1707 Kikin was put in charge of the Admiralty Shipyard.
He was a groomsman at Peter's second wedding.
Kikin's old rivalry with Alexander Menshikov put him in a precarious position, however.
In 1715 he was arrested on suspicion of graft and was forced to leave the capital for Moscow.
A year later Peter relented, allowing him to return to the court.
In 1718 Kikin was implicated in the conspiracy of Tsarevich Alexei, tortured and executed.
Among other things he was accused of trying to kill the monarch when he had been asleep.
He had apparently visited Vienna in order to persuade Emperor Charles VI to shelter the heir apparent.
Kikin's properties, including the unfinished Baroque residence in the vicinity of the Smolny Convent, were confiscated by the Tsar.
The much restored Kikin Palace is one of the oldest buildings in the city.
Afrosinya
Yefrosinya Fedorova( also" Euphrosyne, Afrosinya, Afrosina, Ofrosinya"; 1699/ 1700 – 1748), was a Russian serf.
She became the mistress of Alexei Petrovich, Tsarevich of Russia who fled with him on 26 September 1716.
She was the property of Alexei's tutor, Prince Nikifor Vyazemsky, but had originally been a captive from Finland, then a Swedish province, and was there by a Swedish citizen.
Yevdokiya Lopukhina
Tsarina Eudoxia Feodorovna Lopukhina( in Moscow – in Moscow) was a Russian Tsaritsa as the first wife of Peter I of Russia, and the last ethnic Russian and non-foreign wife of a Russian monarch.
They married on 27 January 1689 and divorced in 1698.
She was the mother of Tsarevich Alexei Petrovich and the paternal grandmother of Peter II of Russia.
Abdul-Vahed Niyazov
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Grand Duchess Anastasia Nikolaevna of Russia
Grand Duchess Anastasia Nikolaevna of Russia( – July 17, 1918) was the youngest daughter of Tsar Nicholas II, the last sovereign of Imperial Russia, and his wife, Tsarina Alexandra Feodorovna.
Anastasia was the younger sister of Grand Duchesses Olga, Tatiana, and Maria, and was the elder sister of Alexei Nikolaevich, Tsarevich of Russia.
She was murdered with her family by a group of Bolsheviks in Yekaterinburg on July 17, 1918.
Persistent rumors of her possible escape circulated after her death, fueled by the fact that the location of her burial was unknown during the decades of Communist rule.
The abandoned mine serving as a mass grave near Yekaterinburg which held the acidified remains of the Tsar, his wife, and three of their daughters was revealed in 1991.
These remains were put to rest at Peter and Paul Fortress in 1998.
The bodies of Alexei Nikolaevich and the remaining daughter—either Anastasia or her older sister Maria—were discovered in 2007.
Her possible survival has been conclusively disproved.
Scientific analysis including DNA testing confirmed that the remains are those of the imperial family, showing that all four grand duchesses were killed in 1918.
Several women falsely claimed to have been Anastasia; the best known impostor is Anna Anderson.
Anderson's body was cremated upon her death in 1984, but DNA testing in 1994 on available pieces of Anderson's tissue and hair showed no relation to the Romanov family.
Natalia Alexeievna (Wilhelmina Louisa of Hesse-Darmstadt)
Natalia Alexeievna, Tsarevna of Russia( 25 June 1755 – 26 April 1776), was the first wife of Paul Petrovich, Tsarevich of Russia( future Emperor Paul I), son of the Empress Catherine II.
She was born as Princess Wilhelmina Louisa of Hesse- Darmstadt as the fifth child of Louis IX, Landgrave of Hesse- Darmstadt and his spouse Countess Palatine Caroline of Zweibrücken.
Gerhard Johann von Löwenwolde
Gerhard Johann von Löwenwolde( Гергард Иоганн Левенвольде, died 1721) was a Baltic German Estonian knight.
In the 1690s, he announced support of Johann Reinhold von Patkul's lobbyism against Swedish absolutist threats to Baltic noble privileges, while also working with the Swedish authorities in Estonia.
He served in the Swedish army, and in 1697 was promoted major of the Swedish garrison in Riga.
During the Great Northern War, he first served Augustus the Strong of Saxe- Poland- Lithuania, and after taking an ambiguous stance towards August and Peter the Great of Russia entered Peter's service after the Capitulation of Estonia and Livonia in 1710.
He served as Peter the Great's plenipotentiary of Livonia during the same year, and held that office until 1713, when he became" hofmeister" in the service of Princess Charlotte of Brunswick- Wolfenbüttel, wife of Peter's son Alexei Petrovich, Tsarevich of Russia.
With Magdalene Elisabeth von Löwen he had the following children:
Peter the Great
Peter the Great , Peter I  or Peter Alexeyevich  ruled the Tsardom of Russia and later the Russian Empire from until his death in 1725, jointly ruling before 1696 with his elder half-brother, Ivan V. Through a number of successful wars, he expanded the Tsardom into a much larger empire that became a major European power and also laid the groundwork for the Russian navy after capturing ports at Azov and the Baltic Sea.
He led a cultural revolution that replaced some of the traditionalist and medieval social and political systems with ones that were modern, scientific, Westernised and based on the Enlightenment.
Peter's reforms had a lasting impact on Russia, and many institutions of the Russian government trace their origins to his reign.
He is also known for founding and developing the city of Saint Petersburg, which remained the capital of Russia until 1917.

Question: Where did Alexei Petrovich, Tsarevich Of Russia's father die?
Answer: Saint Petersburg