Mihrdat Ier , or Mithridate Ier , was a king of Karthlie which reigned of 58 with 106 according to the rectified Chronology of Cyrille Toumanoff.

Wire of Pharsman Ier of Georgia, it succeeded to him its death in the year 58. According to the Géorgienne Chronicle which called this king Aderk and allots to him a 57 years reign of 2 av. J.C with 55 ap. J.C, he would have been a contemporary of Jesus-Christ.

• Bartom II King of Mtskheta, wire of Aderk and the girl of the king of Arménie.

• Qartam King d' Armaz,
• Amazasp, which would have become later the king Amazap Ier de Karthlie

Under the council of the aznaouris (noble), it would have divided its kingdom between his two oldest sons Bartom II king of Mtskheta and Qartam king of the Fortress of Armaz:

• 55 - 72: Bartom II king of Mtskheta & Qartam king d' Armaz
• 72 - 87: Kaos king of Mtskheta & Pharasman Ier king d' Armaz
• 87 - 103: Armazel king of Mtskheta & Azork king d' Armaz
• 103 - 113: Derok king of Mtskheta & Amazasp Ier king d' Armaz
• 113 - 122: Mirdhat Ier king of Mtskheta & Pharsman II king d' Armaz

According to the ancient sources, the two royal lines would thus have reigned on the two parts of the kingdom during five generations. In addition to the inconsistencies of the dates suggested this system is at the very least very improbable. It thus seems as Cyrille Toumanoff considers it that the only successor of king Mirdhat Ier was his Amazap son Ist.