Riddle began attending Hogwarts School of Witchcraft and Wizardry in 1938 and was sorted into Slytherin house. Some of his early activities included the opening of Salazar Slytherin's Chamber of Secrets and the use of its monster to attack Muggle-born students; several months' service as a purchasing agent for the Dark artefacts shop Borgin and Burkes; use of the ability to speak Parseltongue; and the attainment of immortality between the years of 1943 and 1998, a process begun upon the creation of his first Horcrux at the age of sixteen.
