Cepheus Castor Black (1720-1769) was an early memer of the Black family.
Cepheus attended Hogwarts in Slytherin House from 1731 to 1738 and was teached by Ambrose Scott. He was the last male heir of the House of Black in his time, therefore he married his cousin Vulpecula and had issue:
- Amorette Black (1747-1789), who married Francois Perroult.
- Aries Black (1750-1803), who became courtier, married Cordelia and had two sons.
- Allegra Black (1752-1804)