Arantir I Birzartanzuir (1147-1468), was the second king of Birzartanšes (1245-1437). His rule is notable for his general incompetence, having lost his overlordship over his cousin Kaltan II of Baharkand in 1261 and having failed to retake it during the the Baharkandi-Birzartanšesi War. This war would provoke the Dartaxes' Rebellion leading to Arantir being forced to acknowledge the independence of the first Human King in Bulwar in four centuries with the peace treaty of 1436.
Following this failure, his daughter Keladora organized a palace coup and took power while organizing for his retirement in a manor located deep in the Šad Kuz mountains.