Договор об образовании СССР
Of the eleven individuals appointed head of state, three died in office of natural causes (Leonid Brezhnev, Yuri Andropov and Konstantin Chernenko), one held the position in a temporary role (Vasili Kuznetsov), and four held posts of party leader and head of state simultaneously (Brezhnev, Andropov, Chernenko and Mikhail Gorbachev). The first head of state was Mikhail Kalinin, who was inaugurated in 1922 after the Treaty on the Creation of the USSR. At over twenty years, Kalinin spent the longest time in office; he died shortly after his resignation in 1946. Andropov spent the shortest time in office.