1170 On this day in history birth of isabelle of Hainaut, queen of France (d. 1190)
1185 On April - 23 birth of king Afonso II of Portugal (d. 1223)
1464 On this day in history birth of johanna van Valois, Queen of France
1464 Robert Fayrfax, composer was born on April - 23.
1484 Julius Caesar Scaliger, Italy, scholar (On the Subtlety of Things) was born on this day in history.
1500 On this day in history birth of alexander Alesius, [Aless/Alane], System theologist/physician
1500 On this day in history birth of alexander Ales, Scottish theologian (d. 1565)
1516 Georg Fabricius, German poet, historian, and archaeologist (d. 1571) was born on this day in history.
0034 Death of Christ, crucified, according to Isaac Newton on this day in history.
0303 Death of George, knight/saint/patron of England, beheaded on April - 23.
0725 Death of Wihtred, King of Kent on April - 23.
0871 Ethelred I, king of Wessex/brother of Alfred the Great, dies on April - 23.
0990 Ekkehart II, [Palatinus], monk to St-Gallen/poet, dies on this day in history.
0997 On April - 23 vojtech "Adalbert" of Prague, 2nd bishop of Prague/apostle, dies at 40
1014 Brian Boru, king of Ireland, dies in battle at 87 on this day in history.
1016 On April - 23 aethelbred II "the Unready", king of England (979-1016), dies