Mariam Dadiani

Mariam Dadiani was a daughter of Manuchar I Dadiani, Prince of Mingrelia, by his second wife, Tamar Jaqeli. Thrice married, successively to Simon I Gurieli, Prince of Guria, in 1621, King Rostom of Kartli in 1638, and the latters adopted son and successor, King Vakhtang V in 1658.

Mariams only child, born of her first marriage to Prince Gurieli, died young. The childless Rostom, anxious to secure the dynastic survival of the Bagrationi family under the protection of the Safavid empire of Iran, adopted the prince of Mukhrani, also of Bagrationi descent, who succeeded on his death as Vakhtang V and married the queen dowager Mariam as her third husband. She outlived Vakhtang and died aged over 70. She was buried with royal honors at the Cathedral of the Living Pillar at Mtskheta.

Source: Wikipedia