Potamon of HeracleaSaint Potamon of Heraclea was a bishop of Heraclea in Egypt who was persecuted under the emperor Maximinus Daza, attended the First Council of Nicaea, then was martyred in Egypt by the Arians.His feast day is 18 May.Roman MartyrologyThe Roman Martyrology of 1914 has an entry under May 18;Monks of Ramsgate accountThe monks of St Augustine's Abbey, Ramsgate wrote in their Book of Saints,Butler's accountThe hagiographer Alban Butler wrote in his Lives of the Fathers, Martyrs, and Other Principal Saints under May 18,