Place of Birth: Durham South Eastern, Durham, England, U.K.
Date of Birth: 17 October, 1966
Ethnicity: English, Irish
Mark Gatiss is a British actor, comedian, screenwriter, and novelist. He is the son of Winifred Rose (O’Kane) and Maurice Gatiss. His mother was born in Londonderry, Northern Ireland. He is married to actor Ian Hallard.
Mark’s paternal grandfather was George Gatiss (the son of Henry Oscar Gatiss and Elizabeth Wilson). George was born in Byers Green, County Durham, England. Henry was the son of George Moore Gatiss and Jane Ann Coulson.
Mark’s paternal grandmother was named Nellie Turner. Nellie was born in Sheffield, South Yorkshire, England.
Mark’s maternal grandfather was Jeremiah Vincent O’Kane (the son of John O’Kane and Margaret O’Mullan). Jeremiah was born in Garvagh, Londonderry, Northern Ireland. Margaret was the daughter of Jeremiah O’Mullan and Elizabeth O’Kane.
Source: Genealogy of Mark Gatiss – https://www.geni.com