Arcturus Black I

Arcturus Black I (1835 - 1893) was an early member of House of Black, a pure-blood wizard. He was probably an uncle of Phineas Nigellus Black, and his sibling Isla, Elladora and Sirius, maybe a brother of Cygnus Black I.

Etimology
Arcturus is a name of star. There were also Arcturus Black II and III.