Teimuraz I of Kakheti
Alexander succeeded upon the death of his father, George III of Imereti, in 1639. Most of his reign was spent in the struggle against the powerful prince of Mingrelia, Levan II Dadiani, who refused to acknowledge the king of Imereti as his overlord, and aspired to displace him from his throne. In one of the battles, Dadiani captured and blinded Alexander’s energetic brother Mamuka, bringing the king to the edge of despair. Alexander’s father-in-law, Teimuraz I of Kakheti, who had fled the Saffavid Persian invasion of his country to Imereti, attempted to mediate the conflict, but nothing came of this.