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When did St. Anselm of Canterbury write the Proslogion?

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Luca della Robbia: St. Anselm of Canterbury — St. Anselm of Canterbury St. Anselm of Canterbury (center), terra-cotta altarpiece by Luca della Robbia; in the Museo Diocesano, Empoli, Italy.

St. Anselm of Canterbury wrote the Proslogion in 1077 or 1078.1

This work, which he originally titled Fides quaerens intellectum ("Faith Seeking Understanding"), is famous for establishing the ontological argument for the existence of God.21