Oh my God, are we actually discussing Canadian current events?

Black only gave up his citizenship because Jean Chretien wouldn't allow him to accept the title Lord from England as a Canadian. He often said he wished he could have both, but refused to pass up the honour because of the Liberal Prime Minister's pettiness (in the past, others have been allowed to accept British titles as Canadians... being a Commonwealth country and all).

He is also working at getting it back, for what it is worth.