In 1672 he made a public avowal of his conversion to Roman Catholicism.
Agrippa, the grandson of Herod the Great, was an avowed partisan of the new emperor and had paid penalty for a premature avowal of his preference.
That the Armenians appropriated from the Syrians this, as well as the stories of Bartholomew and Thaddeus (the Syriac Addai), was merely an avowal on their part that Edessa was the centre from which the faith radiated over their land.
She summoned him to declare his reasons for it in presence of the French ambassador and an assembly of the nobles; she besought him for God's sake to speak out, and not spare her; and at last he left her presence with an avowal that he had nothing to allege.
The passage of a bill proposed by him (November 1 775) to arm and equip ships to prey upon British commerce, and for the establishment of a prize court, was, according to his biographer, Austin, " the first actual avowal of offensive hostility against the mother country, which is to be found in the annals of the Revolution."