1220 Emperor Go-Saga of Japan (d. 1272) was born on April - 01.
1283 Ludwig IV of Baveria, Roman Catholic Bavarian emperor (1314-47) was born on this day in history.
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 On this day in history birth of gaspar de Crayer, Flemish painter
1582 Thomas Simpson, composer was born on April - 01.
1610 Charles de Saint-Évremond, French soldier (d. 1703) was born on April - 01.
1640 On April - 01 birth of georg Mohr, Danish mathematician (d. 1697)
1085 On this day in history death of emperor Shenzong of China (b. 1048)
1132 On this day in history death of st-Hugues, Bishop of Grenoble (b. 1053)
1204 On April - 01 eleanor of Aquitaine, wife of Louis VII & Henry II, dies at 81
1205 Amalrik II, King of Cyprus/Jerusalem, dies on this day in history.
1528 On April - 01 death of francisco de Peñalosa, Spanish composer
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 On this day in history death of gillis van Valkenborch, Flemish painter, buried at about 72