of Damascus. In 1209, the brothers Mkhargrzeli laid waste to Ardabil – according to the Georgian and Armenian annals – as a revenge for the local Muslim ruler's attack on Ani and his massacre of the city's Christian population. In a great final burst, the brothers led an army marshaled throughout Tamar's possessions and vassal territories in a march, through Nakhchivan and Julfa, to Marand, Tabriz, and Qazvin in northwest Iran, pillaging several settlements on their way. Georgians reached countries where nobody had heard of either their name or existence. These victories brought Georgia to the summit of its power and glory, establishing a pan-Caucasian Empire that extended from the Black Sea to the Caspian Sea and from the Caucasus Mountains to Lake Van. Trebizond and the Middle East 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