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