Who was the first Tsar of Russia from the House of Romanov?

Mikhail (Michael) Fyodorovich Romanov was unanimously elected Tsar by the Zemsky Sobor, a feudal Estates parliament that was active in Russia in the 16th-17th centuries, in 1613. During the end of the 16th and early 17th century, Russia was gripped by the "Time of Troubles". It started with the death of Tsar Feodor I, the last of the long-ruling Rurik dynasty. A war with the Polish-Lithuanian Commonwealth raged on during this time, leading to the occupation of the Kremlin by Polish forces. Nearly 1/3 of the population died from a famine, and impostor Tsars attempted to seize the throne.

The Zemsky Sobor met and elected the 16-year-old nephew of Feodor I. Peace treaties with the Polish-Lithuanian Commonwealth and Sweden allowed for the foreign occupation to end. With Michael's election and treaties in place, the Time of Troubles ended.

Tsar Michael suffered from a leg injury which resulted in him not being able to walk towards the end of his life. He was married twice, his first wife died after only four months of marriage, his second wife bore 10 children, four of them reaching adulthood. Alexei, the Tsar's oldest son, succeeded him as Tsar in 1645. Alexei was father of Peter the Great.