Cygnus Phineas Black, pureblood, Knight, ex-dueling champion, youngest son, father of the Black sisters. Walburga's failure to conceive and Alphard's bachelorhood landed him the responsibility of continuing the bloodline, and so he was wed to the French Druella Rosier. The passionless marriage left them with three children -- all daughters, never a son: Bellatrix, his favorite; Andromeda, the odd one out; and Narcissa, the baby. Attended Hogwarts while Tom Riddle was still a student and so had a fast-track entry to the all boy's club of the Knights of Walpurgis. Purist ideology was never a question with Cygnus, but unlike many, he is not blinded by Riddle's charisma -- his allegiance is to the Blacks first. There is only one sure way to shake Cygnus from his cool, and that is to threaten his family -- The Family, as it were, capital letters and all. Like the bird that is his namesake, any perceived danger to his kin will rouse an anger that is frightening and almost deranged; he had to be magically restrained from setting off after Ted Tonks once the degree of his involvement with Andromeda was revealed. One of the three Black 1979 deaths.

Significant dates
1925 -- Walburga born
192X -- Alphard born
1929 -- Orion born
21 February, 1929 -- Cygnus born
1940-1947 -- Cygnus attends Hogwarts
1947 -- Meets Druella Rosier
1950 -- Cygnus marries Druella Rosier
21 March, 1951 -- Bellatrix born
15 March, 1953 -- Andromeda born
2 October, 1955 -- Narcissa born
1972 -- Andromeda disowned
1975 -- Bellatrix marries Rodolphus Lestrange
1979/80 -- Cygnus, Orion, and Regulus die