Maria lived in Oslo until her death in 1980. They had no children. Upon her death, she donated all their Russian antiques to a charitable fund that still operated in Oslo as of August 2017. For most of his later political career, Quisling lived in a mansion on Bygdøy in Oslo that he called "Gimle," after the place in Norse mythology where survivors of the great battle of Ragnarök were to live. The house, later renamed Villa Grande, in time became a Holocaust museum. The "Nasjonal Samling" movement was wiped out as a political force in Norway, though Quisling himself has become one of the most written about Norwegians of all time. The word "quisling" itself became synonymous with "traitor." The term was coined by the British newspaper "The Times" in its lead of 15 April 1940, titled "Quislings everywhere." The noun survived, and for a while during and after World War II, the back-formed verb "to quisle" was used. One who was "quisling" was in the act of committing treason.