December 5 (Eastern Orthodox liturgics) - Wikipedia
https://en.wikipedia.org/wiki/December_5_(Eastern_Orthodox_liturgics)
Dec 4 - Eastern Orthodox liturgical calendar - Dec 6. All fixed commemorations below ... December 5 (Eastern Orthodox liturgics) ... Venerable Gratus, monk.
December 5 - OrthodoxWiki
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... (see also October 25); Venerable Gratus, monk; Venerable Nonnus, monk; ... Saint Cawrdaf, a noble in Wales, ended his life as a monk with St Illtyd (6th c.) ...