All events in April :  

Births:

1 . Emperor Go-Saga of Japan , was born 1. April 1220. (died 1272)

2 . François de Bonne, Duke of Lesdiguières was born 1. April 1543. (died 1626)

3 . William Harvey, English physician was born 1. April 1578. (died 1657)

4 . Charles de Saint-Évremond, French soldier was born 1. April 1610. (died 1703)

Deaths:

1 . Emperor Shenzong of Song , died 1. April 1085. (born 1048)

2 . Hugh of Châteauneuf, French bishop died 1. April 1132. (born 1053)

3 . Eleanor of Aquitaine , died 1. April 1204. (born 1122)

4 . Amalric II of Jerusalem , died 1. April 1205. (born 1145)

Events:

1 . Emperor Diocletian elevates his general Maximian to co-emperor with the rank of Augustus and gives him control over the Western regions of the Roman Empire. (1. April, 286)

2 . Crown Prince Jin Chengdi, age 4, succeeds his father Jin Mingdi as emperor of the Eastern Jin Dynasty. (1. April, 325)

3 . Majorian is acclaimed emperor by the Roman army. (1. April, 457)

4 . Byzantine Emperor Justin I names his nephew Justinian I as co-ruler and successor to the throne. (1. April, 527)