“In that [synod of the Angles] it is distinctly recognized that such a decree and judgment is very firmly commanded and diligently demonstrated, so that whoever had been washed without the invocation of the Trinity, he has not been perfected, unless he shall have been baptized in the name of the Father, and of the Son, and of the Holy Spirit.”  Pope St. Zachary, “Sacris Liminibus”, May 1, 748