 Arintero was born in Lugueros, León, and entered the Dominican Order at Corias (Asturias) in 1875.As a specialist in the natural sciences, he taught at colleges in Vergara, Corias, Valladolid and later at the Pontifical University of Saint Thomas Aquinas, "Angelicum" in Rome.In 1921 he founded in Bilbao the magazine "La Vida Sobrenatural".