Aigusta Anastasia of Lithuania

Aigusta Anastasia of Lithuania (Анастасия Гедиминовна; c. 1320 – 1345) was the princess of Moscow during her marriage to Simeon, the grand prince of Vladimir and prince of Moscow. Most likely she was the daughter of Gediminas, the grand duke of Lithuania.

Life
There is no direct evidence that she was a daughter of Gediminas, but because of her high-profile marriage, most historians have concluded that she was a member of Gediminas' family. She was born probably between 1316 and 1321.

Aigusta was baptized as Anastasia in order to marry Simeon of Moscow in November or December 1333. The marriage had great potential because Lithuania and Moscow were fierce rivals for supremacy in Ruthenia, but conflicts broke out again in 1335, just two years after the marriage.

Her two sons Vasily and Konstantin did not survive infancy; her daughter Vasilisa in 1350 married Mikhail Vasilevich of Kashin, a Tverite prince opposing Lithuania. Her brother Jaunutis sought her help when he was deposed by Algirdas in 1345. Immediately before her death on March 11, 1345, Augusta became a nun. She was buried within the Moscow Kremlin at a monastic church whose construction she had sponsored.