Alexei Mikhailovich ( ; 29 March [O.S. 19 March] 1629 – 8 February [O.S. 29 January] 1676), also known as Alexis, was Tsar of all Russia from 1645 until his death in 1676. He was the first tsar to sign laws on his own authority and his council passed the Sobornoye Ulozheniye of 1649, which strengthened the bonds between autocracy and the lower nobility. Wikipedia