As Hogwarts only has one teacher for each subject, it may seem a bit odd that he would not have taught Sirius. The book explains this differently, however. In addition to teaching Potions, Slughorn was also head of Slytherin House, where all of the Blacks were sorted, except for Sirius. So while Slughorn taught Sirius, he never had him in Slytherin. Quidditch is a wizarding sport played on broomsticks. It is the most popular game among wizards and witches, and, according to Rubeus Hagrid, the equivalent to. A page for describing Characters Harry Potter Hogwarts Teachers. Where Can I Watch Top Gear Season 22. Main Character IndexThe Harry Potter logo, used first in American editions of the novel series and later in films.