Phineas Nigellus Black is the great-great-grandfather of Sirius Black. Being a past headmaster of Hogwarts School of Witchcraft and Wizardry, his portrait hangs in the Headmaster’s office. He also has a portrait in 12 Grimmauld Place, which Hermione placed in her beaded bag when the trio were on the run from the Death Eaters. According to Albus Dumbledore, Phineas was the single most hated headmaster in recent Hogwarts history. Phineas has a dislike of speaking to young people, whom he finds tedious and self-absorbed. Like most of the Black family, he supports blood purity and looks down on Muggle-borns