All events in December :  

Births:

1 . Louis VI of France , was born 1. December 1081. (died 1137)

2 . Anna Komnene, Byzantine physician and scholar was born 1. December 1083. (died 1153)

3 . Takeda Shingen, Japanese daimyo was born 1. December 1521. (died 1573)

4 . Tadeáš Hájek, Czech physician and astronomer was born 1. December 1525. (died 1600)

Deaths:

1 . Henry I of England , died 1. December 1135. (born 1068)

2 . Isabella of England , died 1. December 1241. (born 1214)

3 . Emperor Go-Komatsu of Japan , died 1. December 1433. (born 1377)

4 . Lorenzo Ghiberti, Italian sculptor died 1. December 1455. (born 1378)

Events:

1 . Charlemagne judges the accusations against Pope Leo III in the Vatican. (1. December, 800)

2 . Henry V of England enters Paris. (1. December, 1420)

3 . Francis Walsingham is knighted. (1. December, 1577)

4 . End of the Iberian Union: Portugal acclaims as King João IV of Portugal, ending 60 years of personal union of the crowns of Portugal and Spain and the end of the rule of the Philippine Dynasty. (1. December, 1640)