* [[Constantin cel Mare]] (†337), [[May 21mai]]<ref>Great Synaxaristes: ''[http://www.synaxarion.gr/gr/sid/3295/sxsaintinfo.aspx Οἱ Ἅγιοι Κωνσταντίνος καὶ Ἑλένη οἱ Ἱσαπόστολοι].'' 21 Μαΐου. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.</ref><ref>''[http://ocafs.oca.org/FeastSaintsViewer.asp?SID=4&ID=1&FSID=101452 Equal of the Apostles and Emperor Constantine with his Mother Helen].'' OCA - Feasts and Saints.</ref>* [[Constantine of Cornwall]], "King of Dumnonia", British king and Martyr who gave up his crown to join St. David's monastery at Menevia, Wales, missionary to the Picts (†576), [[March 9martie]]<ref>Great Synaxaristes: ''[http://www.synaxarion.gr/gr/sid/2392/sxsaintinfo.aspx Ὁ Ἅγιος Κωνσταντίνος ὁ Μάρτυρας ὁ τῆς Κορνουάλλης].'' 9 Μαρτίου. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.</ref> (''Cornish and Welsh tradition''), and [[March 11martie]] (''Irish and Scottish traditionîn tradițiile irlandeză și scoțiană'').<ref group="note">See ''[[w:Constantine (British saint)|Constantine (British saint)]]'' and ''[[w:Constantine of Dumnonia|Constantine of Dumnonia]].'' Note that the ''Great Synaxaristes'' also includes an additional, separate entry for [[May 9mai]] for a certain '''"Constantine the martyr, King of the Scots"''', who is similarly listed as having been martyred in the year 576 AD as well, perhaps pointing to the same Saint although this is uncertain.<br>

* Constantin de Beauvais, a monk with St [[w:Philibert of Jumièges|Philibert]] at Jumièges in France, then Bishop of Beauvais (''Lat.: Diocesis Bellovacensis''), (†706), [[June 15iunie]]<ref>Great Synaxaristes: ''[http://www.synaxarion.gr/gr/sid/3820/sxsaintinfo.aspx Ὁ Ὅσιος Κωνσταντίνος Ἐπίσκοπος Μπεβαί Γαλλίας].'' 15 Ιουνίου. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.</ref><ref>''[http://www.orthodoxengland.org.uk/stdjun.htm Constantine June 15].'' Latin Saints of the Orthodox Patriarchate of Rome.</ref>

* Constantine of Cyprus the WonderworkerConstantin al Ciprului, făcătorul de minuni, Martyrmucenic, and those with him (†ca.12th c.?), [[July 1iulie]]<ref>Great Synaxaristes: ''[http://www.synaxarion.gr/gr/sid/7/sxsaintinfo.aspx Ὁ Ἅγιος Κωνσταντῖνος ὁ Θαυματουργός ὁ Ἀλαμάνος καὶ οἱ σὺν αὐτῷ].'' 1 Ιουλίου. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.</ref>* Constantine of Constantin de Kosinsk, Abbot of Stareț la Kosinsk, Pskov (†ca.1240), [[July 29iulie]]<ref>''[http://ocafs.oca.org/FeastSaintsViewer.asp?SID=4&ID=1&FSID=102124 Venerable Constantine the Abbot of Kosinsk, Pskov].'' OCA - Feasts and Saints.</ref>* [[Constantine XI Palaiologos]] (†1453), [[May 29mai]]<ref>''[http://www.holytrinityorthodox.com/calendar/index.php?year=2011&today=11&month=6&trp=0&tzo=-4 June 11 / May 29].'' Orthodox Calendar. HOLY TRINITY RUSSIAN ORTHODOX CHURCH (A parish of the Patriarchate of Moscow).</ref><ref>''[http://days.pravoslavie.ru/en/Days/20110529.htm May 29/June 11].'' Orthodox Calendar (PRAVOSLAVIE.RU).</ref><ref group="note">Eastern Orthodox consider Constantine XI a saint (or a ''national martyr'' or ''ethnomartyr''), although he has not been officially recognized as such by the Greek Orthodox Church. However, the erection of the statue of "Saint Constantine XI the Ethnomartyr" in the square in front of the Metropolitan Cathedral of Athens, with the formal blessing of the Church authorities, appears to be a semi-official act of recognition.</ref>* Constantine of Novotorzanin, Fool-for-Christ, of Novotorzanin, Russia (†16th c.), [[May 21mai]]<ref>Great Synaxaristes: ''[http://www.synaxarion.gr/gr/sid/3310/sxsaintinfo.aspx Ὁ Ἅγιος Κωνστανίνος ὁ διὰ Χριστὸν Σαλός].'' 21 Μαΐου. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.</ref><ref group="note">St. Constantine is mentioned by Archbishop Dmitri Sambikin (1905-1908), in the Menologion and Paterikon of [[w:Tver|Tver]].</ref>