1220 Emperor Go-Saga of Japan (d. 1272) was born on April - 01.
1283 On this day in history birth of ludwig IV of Baveria, Roman Catholic Bavarian emperor (1314-47)
1543 On this day in history birth of françois de Bonne, duc de Lesdiguières, Constable of France (d. 1626)
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 On this day in history birth of thomas Simpson, composer
1610 Charles de Saint-Évremond, French soldier (d. 1703) was born on April - 01.
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 On April - 01 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 On April - 01 amalrik II, King of Cyprus/Jerusalem, dies
1528 On this day in history death of francisco de Peñalosa, Spanish composer
1548 On April - 01 sigismund I, the Elder, King of Poland, dies at 81
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