Her life and service to the Orthodox Church:

Saint Nino of Cappadocia, a relative of Saint George, was the daughter of Zabulon, a Roman army chief, and Sosana, the sister of Patriarch Juvenal of Jerusalem. After moving to Jerusalem, Nino’s father became a monk, and Nino was raised in the Christian faith by an elderly woman named Sara Niaphor. Nino prayed to the Theotokos for guidance to travel to Georgia and preach the Gospel. The Virgin Mary appeared to her in a dream, giving her a cross made of grapevines as a symbol of protection.
Nino’s missionary journey took her through Rome, where she baptized Princess Rhipsimia and her nurse. Fleeing persecution from Emperor Diocletian, Nino eventually reached Georgia. There, she began preaching and performing miracles, including healing Queen Nana and converting many Georgians to Christianity. Despite resistance from King Mirian, who initially planned to kill the Christian converts, he was miraculously guided to Christ during a hunting trip and vowed to build a church in Nino’s honor.
Through Nino’s efforts, Georgia became a Christian nation. She later reposed in Bodbe, Georgia, where she was buried, and a church was later built over her grave in honor of Saint George.
The life above is summarized from the website of the Orthodox Church in America.