Aelia Pulcheria (January 19, 398 or 399 – 453) was the daughter of Eastern Roman Emperor Arcadius and Empress Aelia Eudoxia. She was the second child born to Arcadius and Eudoxia. Her oldest sister was Flaccilla born in 397, but is assumed she had died young. Her younger siblings were Theodosius II, the future emperor and Marina, both born in 401. When her father Arcadius died in 408, her brother Theodosius II was made Emperor of the Eastern Roman Empire, at seven years old. On July 4, 414 a fifteen year old Pulcheria proclaimed herself regent over her brother, then thirteen, and made herself Augusta and Empress of the Eastern Roman Empire. According to the ancient historian Sozomen, in his Ecclesiastical History, Pulcheria took a vow of virginity when she became Augusta, and her sisters followed suit. Theodosius II died on July 26, 450, and Pulcheria soon married Marcian on November 25, 450. Marcian and Pulcheria were proclaimed Emperor and Empress of the Eastern Roman Empire. Three years later, in July of 453, Pulcheria passed away; she was later made a saint by the Roman Church. Pulcheria is known to have held a significant amount of power in her brother's reign as emperor. Pulcheria was also of great influence over the church and theological practices of this time. She had influence over anti-pagan policies, church building projects, and the debate over the Marian title Theotokos (Mother of God).