Sirius Black I

Sirius Black I (1845 - 1853) was a pure-blood wizard, possibly the eldest son of Cygnus Black and Ella Max, and the elder brother of Phineas Nigellus, Elladora and Isla. Sirius died when he was only eight years old, for unknown reasons.

Etymology
Sirius is a name of very bright star. In the Black family there were also Sirius Black II (a nephew of Sirius I, son of Phineas Nigellus) and Sirius III, Walburga's and Orion's son. If Cygnus was his father, Arcturus Black I was his uncle.

Behind the scenes
Sirius was maybe a son of Cygnus Black I and his wife Ella Max, but if this is true, that means Cygnus was 16 years old when he had Sirius. This is possibly a mathematical mistake. If Cygnus was his father, Arcturus Black I was his uncle. His aunt was possibly Mrs Blishwick.

Appearances

 * Harry Potter and the Order of the Phoenix (film)

Notes and references
Sirius Black I