In 826, Sahak allied with his ancient enemy – Sevada, the Qaisite emir of Manazkert – against the governor of Caliph, but he was defeated and died in Kavakert. His son Grigor-Sufan succeeded him as prince of Western Syunik. In the Eastern region, Philipo died on 10 August 848. He was succeeded by three children (Babgen, Vasak-Ichkhanik and Achot) that ruled jointly. Babgen fought with Grigor-Sufan and killed him (sometime in 849–851) but Babgen died shortly after (851) and Vasak-Ichkhanik (Vasak IV) followed him. Vasak-Ichkhanik had peaceful relations with Vasak-Gabor, who had ascended to the throne of Western Syunik, replacing his father Grigor-Sufan. Nerseh Pilippean, brother of Babgen, directed (822–23) an expedition to Aghuania defeating and killing the prince Varaz-Terdat II (of the Persian dynasty Mihrakane of Aghuania) in Morgog. A general sent by the Caliph, Bugha al-Kabir, destroyed Armenia and Aghuania in these years and sent a detachment to Eastern Syunik where was governing Vasak IV with his brother Achot. The people of Syunik were sheltered in the fortress of Balq, but Vasak fled to Kotaiq, and was pursued to the region of Gardman on the eastern border of Lake Sevan. Gardman's prince (ichkhan) Ketridj or Ketritchn betrayed him and delivered him to Bogha (859). Achot was also seized (859). But Bogha invaded Gardman and imprisoned Kertridj. He then went to Outi where he captured the prince of Sevordiq, Stephannos Kun.