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Serlo (died c. 1148) was a medieval abbot of Cirencester Abbey in England as well as Dean of Salisbury. Serlo was a canon of Salisbury Cathedral. He was a native Englishman, the son of a blacksmith named Sired. His mother was named Leoflæd. He and his mother owned land in Gloucester, which the two of them sold to Gloucester Abbey in 1129. Serlo had a son named Bartholomew, who consented to the sale in 1129.