May 20 (Eastern Orthodox liturgics)
May 19 - Eastern Orthodox Church calendar - May 21
All fixed commemorations below celebrated on June 2 by Orthodox Churches on the Old Calendar.
For May 20th, Orthodox Churches on the Old Calendar commemorate the Saints listed on May 7.
St. Lydia of Thyatira.
St. Marcus Eremita.
Church of St. Theodore of Pavia, in Pavia.
The martyred Anglo-Saxon king Æthelberht II of East Anglia (depiction of a brass plate from Hereford Cathedral).
St. Daumantas of Pskov.
St. Stephen of Piperi.
St. Alexius, Metropolitan of Moscow.
Greek Sources
Russian Sources
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Wikipedia