May 18 (Eastern Orthodox liturgics) - Wikipedia
https://en.wikipedia.org/wiki/May_18_(Eastern_Orthodox_liturgics)
May 17—Eastern Orthodox Church calendar—May 19. All fixed commemorations below ... Martyr Dioscorus, in Cynopolis of Egypt (305); Martyrs Symeon, Isaac, and Bachtisius of Persia (339); Hieromartyr Potamon (Palæmon), Bishop of Heraclea in Egypt, and Confessor (340); The Holy clergy and lay martyrs massacred ...
OrthodoxWiki
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Dec 20, 2016 - May 18 2017: ... May 16 - Greek); Hieromartyr Potamon (Palæmon), Bishop of Heraclea in Egypt, and Confessor (340); The Holy clergy and lay ...