Orion Arcturus Black (1929-1979) was the second, youngest and only male child of Arcturus Black III and his wife Melania Macmillan. His elder sister was Lucretia Prewett and by incest he married his second cousin Walburga Black and had two sons.
Orion was a very charming man with great sense of fashion and his fathers dark hair combined with his mothers doe eyes.
Orion was a strict father and succesful business man that loved a good deal. He went far too deapen the rights of muggleborns and blood-traitors. At first he approved of Lord Voldemort and his ways but after seeing how far he went, Orion repelled.
Orion attanded Hogwarts School of Witchcraft and wizardry from 1940 to 1947 and was sorted into Slytherin House. He married his second-cousin Walburga out of duty and had two sons: Sirius (1960) and Regulus (1961). When his son died in 1979, Orion heard and had a stroke, killing him too.