April 28 (Eastern Orthodox liturgics) - Wikipedia
https://en.wikipedia.org/wiki/April_28_(Eastern_Orthodox_liturgics)
Apr. 27 - Eastern Orthodox Church calendar - Apr. 29. All fixed commemorations below ... Saint Patricius, Bishop of Prusa, in Bithynia, Martyr (1st century); Saint Mark of Galilee, bishop and martyr (92); Saint Memnon the Wonderworker of ...
OrthodoxWiki
https://orthodoxwiki.org/
Dec 20, 2016 - April 28 2017: ... also April 29 Greek); Saint Mark of Galilee, bishop and martyr ( 92); Saint Patricius, Bishop of Prusa, in Bithynia, Martyr (1st c.); ...