Demetrius I (Georgian: დემეტრე I, romanized: demet're I) (c. 1093 – 1156), from the Bagrationi dynasty, was the King (mepe) of the Kingdom of Georgia from 1125 to 1154 and again from 1155 until his death in 1156.

[2] Demetrius was born in 1093, the eldest son of King David IV of Georgia by his first wife, Rusudan,[3] an Armenian woman.

[5] In 1117, King David sent Demetrius on a punitive expedition to Shirvan,[6] where the young commander quickly earned a reputation for his remarkable military prowess.

His forces captured Kaladzori Castle (later known as Alberd, now Agdash[7]) and returned home with captives and significant wealth, cementing Demetrius's growing fame.

On August 12, 1121, during the Battle of Didgori against the Seljuk Empire, King David IV divided the Georgian army into two, with his son Demetrius leading a hidden reserve.

[10] In 1125,[11] According to the Life of King Demetre, David IV proclaimed his son co-ruler of Georgia and crowned him with his own hands.

While a Georgian army waited in ambush, he offered tribute to Saltukids, ruler of Erzerum and asked the latter to accept him as a vassal.

[19] In the 1140s, Georgian nobles sensed an opportunity when it became apparent that Demetrius had disinherited his eldest son David in favour of the younger, George.

But Demetrius was restored to the throne, and he crowned his younger son, George, as co-ruler and retired to David Gareja monastery.

Shen Khar Venakhi (Georgian: შენ ხარ ვენახი, English: Thou Art a Vineyard), a hymn to the Virgin Mary, is the most famous of them.