The House of Black is a prominent family in the Harry Potter series, known for its pure-blood wizarding lineage. It is the ancestral home of the family, located at 12 Grimmauld Place in London. The house is filled with dark artifacts and portraits of deceased family members, including Sirius Black and Regulus Black. The family is notorious for its strong beliefs in blood purity and has produced several notable dark wizards. The House of Black is also significant for its connection to the Order of the Phoenix, as it serves as a headquarters for the group during the Second Wizarding War. The family motto, "Toujours Pur," reflects their commitment to maintaining pure bloodlines. Over time, members like Andromeda Tonks and Sirius Black rebelled against these ideals, leading to a rift within the family.