Lesse... which ones are left:

1200-1300 - An important human rights document, often regarded as the forerunner of the US Constitution, was nullified by the pope.

TRUE. John Lackland was forced to sign the Runnymede Charter (Aka Magna Carta) in 1215. Almost immediately, he denounced the charter and the pope backed him, on the grounds that it was signed under duress.

600-700 - The burning question of the day was the date of Easter.

TRUE. The Council of Whitby settled the dispute over the date of Easter between the "Celtic Church" in Scotland, following the rule of St. Columba and the "Catholic Church" in England, following the rule of St. Peter (Augustine).

900-1000 - A lady ejected the Vikings from Derby, with much slaughter.

TRUE. Aethelflaed of Mercia, daughter of Alfred the Great and wife of Ethelred of Mercia, led an attack aginst the Viking city of Derby in 917/18. After the death of her husband (with whom she appears to have co-ruled) in 911, she and her brother Edward worked together to lead a major offensive against the Danes. She dies after the taking of Tamworth c. 919, and Edward annexes the country. Mercia is never an independant kingdom again.