Victorine theologian and spiritual writer. Apparently a native of Scotland, he came to the Abbey of St-Victor in Paris as a young man. His most important theological work, a treatise De Trinitate, presents a complex argument of necessary reasons for a triune deity, based on the nature of love. His other writings are mainly on the spiritual life and scriptural exegesis. He insisted on the importance of demonstration and argument in matters of theology and the folly of relying only on an array of authorities.