Calvinus (Or Calwinus),
a presbyter, is addressed by Alcuin in two letters, dated respectively (in edition of Frobenius) cir. A.D. 797 and 800. From his being mentioned in connection with "Symeon sacerdos," it is conjectured that he was an Englishman. In the first letter occurs "Nil tibi deesse sestimo ill cella sancti Stephani honestse conversationis;" but Frobenius is uncertain: whether this cell is some English monastery, or whether it was that of St. Stephen, at Choisy, in France, to which Calvinus had retired. The second letter is addressed to him jointly with Cuculus, and they are bidden to exhort Symeon to fortitude under his tribulations.