Patriarch Sergius (Russian: ???????? ??????, born Ivan Nikolayevich Stragorodsky, ???? ?????????? ?????????????; January 23 [O.S.
January 11] 1867 – May 15, 1944) was the 12th Patriarch of Moscow and all the Rus', from September 8, 1943 until his death.
He was also the de facto head of the Russian Orthodox Church in 1925-1943, firstly as deputy Patriarchal locum tenens (1925–1937) subsequently as Patriarchal locum tenens (1937–1943).