First millennium A.D.

The following events occurred in the 1st millennium A.D.:
 * 79: Zaccaria Innocenti casts Tarantallegra on himself and dances inside Mount Vesuvius. The volcano also erupts in this year, killing 1,500, presumably including Innocenti.
 * 236: The Diagon Dispensary is established.
 * 819: The 1819 bottles of Berry Ocky Rot sold at the Hog's Head Pub start maturing for a full millennium.
 * c. 962: Primitive broomsticks are first used for transport.
 * c. 993: Hogwarts School of Witchcraft and Wizardry is founded by Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw and Salazar Slytherin. Peeves is apparently "created" at this time, and becomes the school's poltergeist.
 * The Annual broom race, held in Sweden, begins in the 10th century.

Births

 * Serpent of Slytherin (presumed)
 * Salazar Slytherin (assumed)
 * Godric Gryffindor (assumed)
 * Rowena Ravenclaw (assumed)
 * Helga Hufflepuff (assumed)
 * Hankerton Humble (assumed)