Demetrius I of Georgia was a Bagrationi monarch who ruled the Kingdom of Georgia between 1125 and 1156. The son of King David IV, he proved himself a capable military leader early in his life, notably during the Battle of Didgori. His reign involved complex diplomatic negotiations and military campaigns across the Caucasus, including conflicts in Shirvan and Ani. Beyond his political and martial achievements, he was a noted poet, composing religious works such as the hymn to the Virgin Mary, *Thou Art a Vineyard*. He is venerated as a saint in the Orthodox tradition.