Bp. of Urgel in Spain and one of the leaders of the Adoptianist heresy. He was charged as a heretic at the Council of Ratisbon (792) and recanted. He later became convinced of his heresy again and was unmoved by the criticism of his doctrine written by Alcuin. He was formally accused at the Councils of Frankfurt (794) and Aachen (799 or 800); at the latter he again recanted.