Mamuka was a son of King George III of Imereti by his wife Tamar, and a younger brother of George's successor, Alexander III. Both these kings were perpetually harassed by their expansionist neighbor, Levan II Dadiani, Prince of Mingrelia. An able soldier praised by the Georgian chroniclers for his bravery, Mamuka played a prominent role in the war with Dadiani. Levan attempted to win over Mamuka by marrying the prince with his daughter; instead, Mamuka married an Imeretian princess from the Chkheidze family. He had a son, Archil, whose son, Mamuka, was the last known descendant of this family.
In 1634, George III fell into the Mingrelian hands and Alexander had to pay a ransom. Prince Mamuka and his father-in-law Bezhan Chkheidze took refuge with Yusuf I, an Ottomanpasha of Akhaltsikhe, and lived there, at times raiding Imereti and Guria, until being summoned by Rostom, the childless king of Kartli, to become his adopted son and heir apparent. However, a group of nobles of Kartli, who had persuaded Rostom to adopt Mamuka by virtue of his bravery, royal descent, and dynastic kinship, then conspired with Chkheidze to murder Rostom and make Mamuka king of Kartli. The plot collapsed when an assassin mistook a royal bath servant for the king and had to flee, leaving the servant wounded. Rostom refrained from publicizing the incident and, through a private letter, patiently forced Mamuka back to his exile in Akhaltsikhe. Chkheidze and his numbers remained in Kartli to continue their struggle with Rostom.
Last years and death
By 1647, Mamuka was again in Imereti, leading resistance to Levan II Dadiani's renewed offensive. Riding his favorite buckskin horse, he spread terror among the Mingrelians. In one of Dadiani's attack on Imereti, Alexander III, Mamuka's reigning brother, hid the prince's buckskin horse to prevent him from going to battle, either out of fear of losing the brother or, as rumored, out of envy of his military prowess. Mamuka still hurried to charge the Mingrelians, putting them into flight. His horse stumbled when Mamuka speared down a fleeing enemy horseman and the prince fell off on the ground, being captured and brought in chains to Dadiani. Teimuraz I, the Kakhetian king-in-exile, who was related by kinship to both the king of Imereti and the prince Dadiani, attempted to negotiate Mamuka's release, but Levan refused. During yet another outbreak of hostilities with Imereti, Dadiani had Mamuka blinded in prison. Alexander III complained to Rostom and the latter, with the consent of his wife Mariam, sister of Levan Dadiani, solemnly cursed the prince of Mingrelia. Mamuka remained in captivity and in 1654 died, being mourned in Imereti and Kartli.
