21 May Aghios Konstandinos (St. Constantine)

This feast day honors both Aghios Konstandinos and his mother Aghia Eleni (St. Helen) who were the first pro-Orthodox Byzantine rulers. These names are among the most common Greek Christian names, the masculine one, Konstandinos (Kostas, the familiar form) having a rarer female correlate, Konstandina (Dina, the familiar form).