Pope Valentinus

Valentinus, or Valentine, pope for thirty or forty days in 827, was a Roman by birth, and, according to the Liber Pontificalis, was first made a deacon by Paschal I (817-824). Nothing further is known of his history.

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from the 9th edition (1888) of an unnamed encyclopedia

preceded by Pope Eugene II (824-827)

succeeded by Pope Gregory IV (827-844)