The State Tretyakov Gallery (Russian: Государственная Третьяковская Галерея, Gosudarstvennaya Tretyâkovskaya Galereya; abbreviated ГТГ, GTG) is an art gallery in Moscow, Russia, the foremost depository of Russian fine art in the world.The gallery's history starts in 1856 when the Moscow merchant Pavel Mikhailovich Tretyakov acquired works by Russian artists of his day with the aim of creating a collection, which might later grow into a museum of national art.