He entered the Dominic Order at 'St Esteban' School in Salamanca and then in Valladolid. He worked as a teacher at the Convent of Toro and was a prior in Toledo. From 1587 to 1601, he was a Professor of Santiago de Compostela University. He was a prior at St Domingo Convent in Compostela and rector at St Gregory School in Valladolid and Salamanca. In 1611, he was nominated as provincial of the Dominic Order in Cstille and provincial of the Order all over Spain. In 1621, he was nominated as confessor of Prince Felipe, who was later King Felipe IV. In 1623, he was elected archbishop of Damasco and general commissioner of the Crusade in 1631. He filled his most important office in 1632 as a general inquisitor, he was the president of two auto-da-fé, one of them in Madrid (1632) and the other one in Valladolid (1636), where nobody was condemned to die at the stake. As a general inquisitor, he had to intervene in the conflict between the Spanish King and the Holy See owing to a book by Francisco Salgado de Somoza that defended the civil authority against the ecclesiastic one..