May 21st (1237) was a Thursday. It's the 141st day of the year (142nd in leap years) in the Gregorian calendar. There are 224 days left to the end of the year.
May 21st Famous Deaths for 1237
» Olaf the Black, Manx son of Godred II Olafsson
May 21st Holidays in History
» Afro-Colombian Day (Colombia)
» Christian feast day:
» Christopher Magallanes
» Eugène de Mazenod
» Constantine the Great and Christianity e.g Emperor Constantine I
» Earliest day on which Corpus Christi (feast) known as Corpus Christi can fall, while June 24 is the latest; held on Thursday after Trinity Sunday. (Roman Catholic Church)
» Helena of Constantinople, also known as "Feast of the Holy Great Sovereigns Constantine and Helen, Equal-to-the-Apostles." (Eastern Orthodox Church)
» May 21 (Eastern Orthodox liturgics)
» Circassian Day of Mourning (Circassians)
» Armed Forces Day Hungary or Day of Patriots and Military (Hungary)
» Navy Day (Chile)
» Saint Helena Day, celebrates the discovery of Saint Helena in 1502.
» World Day for Cultural Diversity for Dialogue and Development (International observance or International)