Hamazasp Mamikonian (Armenian: Գրիգոր Մամիկոնյան) was the presiding prince of Armenia in 655–661, when the country was under Arab domination.
Hamazasp succeeded Theodore Rshtuni, who led the faction favourable to the Arabs, as well as the pro-Byzantine cavalry commander Mushegh IV Mamikonian.
[3] When the Byzantines returned to Armenia in 657, upon the outbreak of civil war in the Arab caliphate, he immediately switched sides to them.
[2][4] In reaction to his betrayal, the Arabs executed most of the Armenian nobles they held captive.
[2] The Byzantines left Hamazasp in control of Armenia, and gave him the title of kouropalates.