Today, on June 1 (May 19), the Georgian Orthodox Church celebrates the day of entrance of Saint Nino to Georgia (323 A.D.).

Nino reached the borders of ancient Georgian Kingdom ofIberia from the South in about 320. There she placed a Christian cross in the small town of Akhalkalaki and started preaching the Christian faith in Urbnis and finally reaching Mtskheta (the capital of Iberia). Iberian Kingdom has been influenced by the neighboring Persian Empire which played an important role as the regional power in the Caucasus. The Iberian King Mirian III and his nation worshiped the syncretic gods of Armazi and Zaden. Soon after the arrival of Nino in Mstkheta, the Queen of Iberia Nana requested the audience with the Cappadician.

Nana the Queen, who suffered from a severe illness, had some knowledge of Christianity but had not yet converted to it. Nino, restoring the Queen's health, won to herself disciples from the Queen's attendants, including a Jewish priest and his daughter, Abiathar and Sidonia. Nana also officially converted to Christianity and was baptized by Nino herself. Mirian, aware of his wife’s religious conversion, was intolerant of her new faith, persecuting it and threatening to divorce his wife if she did not leave the faith. He secluded himself, however, from Nino and the growing Christian community in his kingdom. His isolation to Christianity did not last long because, according to the legend, while on a hunting trip, he was suddenly struck blind as total darkness emerged in the woods. In a desperate state, King Mirian uttered a prayer to the God of St Nino: If indeed that Christ whom the Captive had preached to his Wife was God, then let Him now deliver him from this darkness, that he too might forsake all other gods to worship Him.

As soon as he finished his prayer, the light appeared and the King hastily returned to his palace in Mtskheta. As a result of this miracle, the King of Iberia renounced idolatry under the teaching of St Nino and was baptized as the first Christian King of Iberia. Soon, the whole of his household and the inhabitants of Mtskheta adopted Christianity. In 326 King Mirian made Christianity the state religion of his kingdom.

After adopting Christianity, Mirian sent an ambassador to Byzantium, asking Emperor Constantine I to have a bishop and priests sent to Iberia. Constantine, having learned of Iberia’s conversion to Christianity, granted Mirian the church lands in Jerusalem and sent the delegation of Bishops to the court of the Georgian King. Roman historian Tyrannius Rufinus in Historia Ecclesiastica writes about Mirians request to Constantine: After the church had been built with due magnificence, the people were zealously yearning for God's faith. So an embassy is sent on behalf of the entire nation to the Emperor Constantine, in accordance with the captive woman's advice. The foregoing events are related to him, and a petition submitted, requesting that priests be sent to complete the work which God had begun. Sending them on their way amidst rejoicing and ceremony, the Emperor was far gladder at this news than if he had annexed to the Roman Empire peoples and realms unknown.

In 334, Mirian commissioned the building of the first Christian church in Iberia which was finally completed in 379 on the spot where now stands the Svetitskhoveli Cathedral in Mstkheta.

Nino, having witnessed the conversion of Iberia to Christianity, withdrew to the mountain pass in Bodbe, Kakheti. St Nino died soon after; immediately after her death, King Mirian commenced with the building of monastery in Bodbe, where her tomb can still be seen in the churchyard.

Nino and its variants remains the most popular name for women and girls in the Republic of Georgia. There are currently 88,441 women over age 16 by that name residing in the country, according to the Georgia Ministry of Justice. It also continues to be a popular name for baby girls.