Among the remarkable events of Tamar's reign was the foundation of the Empire of Trebizond on the Black Sea coast in 1204.
This state was established by Alexios I Megas Komnenos (r. 1204–1222) and his brother, David, in the northeastern Pontic provinces of the crumbling Byzantine Empire with the aid of Georgian troops.
Alexios and David, Tamar's relatives, were fugitive Byzantine princes raised at the Georgian court.
According to Tamar's historian, the aim of the Georgian expedition to Trebizond was to punish the Byzantine emperor Alexios IV Angelos (r. 1203–1204) for his confiscation of a shipment of money from the Georgian queen to the monasteries of Antioch and Mount Athos.
However, Tamar's Pontic endeavor can better be explained by her desire to take advantage of the Western European Fourth Crusade against Constantinople to set up a friendly state in Georgia's immediate southwestern neighborhood, as well as by the dynastic solidarity to the dispossessed Komnenoi.

Tamar sought to make use of the weakness of the Byzantine Empire and the Crusaders' defeat at the hands of the Ayyubid sultan Saladin in order to gain Georgia's position on the international stage and to assume the traditional role of the Byzantine crown as a protector of the Christians of the Middle East.
 Christian Georgian missionaries were active in the North Caucasus and the expatriate monastic communities were scattered throughout the Eastern Mediterranean.
Tamar's chronicle praises her universal protection of Christianity and her support of churches and monasteries from Egypt to Bulgaria and Cyprus.

The Georgian court was primarily concerned with the protection of the Georgian monastic centers in the Holy Land.
By the 12th century, eight Georgian monasteries were listed in Jerusalem.
Saladin's biographer, Bahā' ad-Dīn ibn Šaddād, reports that after the Ayyubid conquest of Jerusalem in 1187, Tamar sent envoys to the sultan to request that the confiscated possessions of the Georgian monasteries in Jerusalem be returned.
Saladin's response is not recorded, but the queen's efforts seem to have been successful: Jacques de Vitry, who attained to the bishopric of Acre shortly after Tamar's death, gives further evidence of the Georgians’ presence in Jerusalem.
He writes that the Georgians were – in contrast to the other Christian pilgrims – allowed a free passage into the city, with their banners unfurled.
Ibn Šaddād furthermore claims that Tamar outbid the Byzantine emperor in her efforts to obtain the relics of the True Cross, offering 200,000 gold pieces to Saladin who had taken the relics as booty at the Battle of Hattin – to no avail, however.
Among the remarkable events of Tamar's reign was the foundation of the Empire of Trebizond on the Black Sea coast in 1204. This state was established by Alexios I Megas Komnenos (r. 1204–1222) and his brother, David, in the northeastern Pontic provinces of the crumbling Byzantine Empire with the aid of Georgian troops. Alexios and David, Tamar's relatives, were fugitive Byzantine princes raised at the Georgian court. According to Tamar's historian, the aim of the Georgian expedition to Trebizond was to punish the Byzantine emperor Alexios IV Angelos (r. 1203–1204) for his confiscation of a shipment of money from the Georgian queen to the monasteries of Antioch and Mount Athos. However, Tamar's Pontic endeavor can better be explained by her desire to take advantage of the Western European Fourth Crusade against Constantinople to set up a friendly state in Georgia's immediate southwestern neighborhood, as well as by the dynastic solidarity to the dispossessed Komnenoi.
Tamar sought to make use of the weakness of the Byzantine Empire and the Crusaders' defeat at the hands of the Ayyubid sultan Saladin in order to gain Georgia's position on the international stage and to assume the traditional role of the Byzantine crown as a protector of the Christians of the Middle East.  Christian Georgian missionaries were active in the North Caucasus and the expatriate monastic communities were scattered throughout the Eastern Mediterranean. Tamar's chronicle praises her universal protection of Christianity and her support of churches and monasteries from Egypt to Bulgaria and Cyprus.
The Georgian court was primarily concerned with the protection of the Georgian monastic centers in the Holy Land. By the 12th century, eight Georgian monasteries were listed in Jerusalem. Saladin's biographer, Bahā' ad-Dīn ibn Šaddād, reports that after the Ayyubid conquest of Jerusalem in 1187, Tamar sent envoys to the sultan to request that the confiscated possessions of the Georgian monasteries in Jerusalem be returned. Saladin's response is not recorded, but the queen's efforts seem to have been successful: Jacques de Vitry, who attained to the bishopric of Acre shortly after Tamar's death, gives further evidence of the Georgians’ presence in Jerusalem. He writes that the Georgians were – in contrast to the other Christian pilgrims – allowed a free passage into the city, with their banners unfurled. Ibn Šaddād furthermore claims that Tamar outbid the Byzantine emperor in her efforts to obtain the relics of the True Cross, offering 200,000 gold pieces to Saladin who had taken the relics as booty at the Battle of Hattin – to no avail, however.
Tamar of Georgia