April 21 (Eastern Orthodox liturgics) - Wikipedia
https://en.wikipedia.org/wiki/April_21_(Eastern_Orthodox_liturgics)
Apr. 20 - Eastern Orthodox Church calendar - Apr. 22. All fixed commemorations below are ... at Sinai (c. 700) (see also: April 20); Martyr Karol (Charles) ...
April 21 (Eastern Orthodox liturgics) - Wikiwand
www.wikiwand.com/en/April_21_(Eastern_Orthodox_liturgics)
Apr. 20 - Eastern Orthodox Church calendar - Apr. 22. ... April 21 (Eastern Orthodox liturgics) - Wikiwand ... 700) (see also: April 20); Martyr Karol (Charles) ...