11th century

The following events occurred in the 11th century:


 * Salazar Slytherin creates the Chamber of Secrets and abandons Hogwarts.
 * Helena Ravenclaw steals her mother's diadem and flees Britain. After hiding the diadem inside of a tree in Albania, she is killed by The Bloody Baron, who then commits suicide. Rowena Ravenclaw passes away not long afterwards.
 * A Gaelic poem on Creaothceann is written.
 * Gertie Keddle watches and writes about one of the first primitive games of Quidditch.

Decades

 * 1000s
 * 1010s
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 * 1080s
 * 1090s