In 1728, Otia accompanied Bezhan to a rendezvous with an Ottoman representative at Geguti in Imereti, where the Dadiani fell into a trap set up by the Imeretian nobleman Zurab Abashidze.
Bezhan was killed by the Turkish dignitary's entourage, but Otia escaped and succeeded his father as Prince of Mingrelia,[1] but not without a conflict with his younger brother Katso whom he had captured and sent for imprisonment in Racha, at the castle of Kvara.
[1] In December 1732, Otia made a common cause with the Abashidze family and Duke of Racha in an attempt to bring down Alexander in favor of the king's brother Mamuka of Imereti.
Their renewed offensive was dashed by the royal army at the battle of Chikhori at which Otia was wounded and made prisoner, and his brother Katsia was killed.
[5] In 1757, the seasoned prince Otia sent his son Katsia with an Mingrelian army to the aid of Solomon I, who won a decisive victory over invading Ottoman troops and their local allies at the battle of Khresili.