1220 On April - 01 birth of emperor Go-Saga of Japan (d. 1272)
1283 On April - 01 birth of ludwig IV of Baveria, Roman Catholic Bavarian emperor (1314-47)
1543 On April - 01 birth of françois de Bonne, duc de Lesdiguières, Constable of France (d. 1626)
1578 William Harvey, England, physician (discovered blood circulation) was born on this day in history.
1582 On this day in history birth of gaspar de Crayer, Flemish painter
1582 On this day in history birth of thomas Simpson, composer
1610 On April - 01 birth of charles de Saint-Évremond, French soldier (d. 1703)
1640 On this day in history birth of georg Mohr, Danish mathematician (d. 1697)
1085 On this day in history death of emperor Shenzong of China (b. 1048)
1132 Death of St-Hugues, Bishop of Grenoble (b. 1053) on this day in history.
1204 On April - 01 eleanor of Aquitaine, wife of Louis VII & Henry II, dies at 81
1205 On this day in history amalrik II, King of Cyprus/Jerusalem, dies
1528 Death of Francisco de Peñalosa, Spanish composer on April - 01.
1548 Sigismund I, the Elder, King of Poland, dies at 81 on April - 01.
1580 On April - 01 death of alonso Mudarra, Spanish composer
1611 Death of Gillis van Valkenborch, Flemish painter, buried at about 72 on April - 01.