4 June 2191, Saturday (21.05 according to the old style)
Trinity Memorial Saturday
Saints commemorated
- Equal-to-the-Apostles Constantine the Great, Equal-to-the-Apostles 272–337
- Equal-to-the-Apostles Equal-to-the-Apostles Constantine and Helen IV век
- Equal-to-the-Apostles Helena, Equal-to-the-Apostles ок. 250 – ок. 330
- Right-believing Prince Constantine (Yaroslav Svyatoslavich) of Murom † 1129
- Righteous Theodore of Ostrov (Oyat) XVI век