Anselm of Canterbury (Aosta c. 1033 – Canterbury 21 April 1109), also called of Aosta for his birthplace, and of Bec for his home monastery, was a Benedictine monk, a philosopher, and a prelate of the church who held the office of Archbishop of Canterbury from 1093 to 1109. Called the founder of scholasticism, he is famous as the originator of the ontological argument for the existence of God.
Born into the noble family of Candia, he entered the Benedictine order at the Abbey of Bec at the age of twenty-seven, where he became abbot in 1079. He became Archbishop of Canterbury under William II of England, and was exiled from England from 1097 to 1100, and again from 1105 to 1107 under Henry I of England as a result of the lay investiture dispute.
Here's a quote from Anselm from Lutheran Catholicity:
Qu Dost thou believe that the Lord Jesus died for thee? Answer. I believe it.
Qu. Dost thou thank him for his passion and death? Ans. I do thank him.
Qu. Dost thou believe that thou canst not be saved except by his death? Ans. I believe it”
“Come then, while life remaineth in thee: in his death alone place thy whole trust; in naught else place any trust; to his death commit thyself wholly, with this alone cover thyself wholly; and if the Lord thy God will to judge thee, say, ‘Lord, between thy judgment and me I present the death of our Lord Jesus Christ; no otherwise can I contend with thee.’ And if he shall say that thou art a sinner, say thou: ‘Lord, I interpose the death of our Lord Jesus Christ between my sins and thee. ‘If he say that thou hast deserved condemnation, say: ‘Lord, I set the death of our Lord Jesus Christ between my evil deserts and thee, and his merits I offer for those which I ought to have and have not.’ If he say that he is wroth with thee, say: ‘Lord, I oppose the death of our Lord Jesus Christ between thy wrath and me. ‘And when thou hast completed this, say again: ‘Lord, I set the death of our Lord Jesus Christ between thee and me.’
Anselm of Canterbury (1033-1109), Opera (Migne), 1:686, 687.