How was Russia been founded and how many Tsars were there in a row?

Answer 1

The Russian Empire was the political descendent of the Duchy of Moscow. Under the period of Mongol rule in Russia, Moscow was able to grow because it was small and remote, and thus escaped the destruction that many larger, more important cities suffered. As Moscow grew in power, it's rulers cooperated much more closely with the Mongols than most, which greatly increased their ecomonic and political power. Eventually, it was Moscow that led the fight to expell the Mongols, a process that started in 1390 and continued until 1480, when it was completed by Ivan III. By that time, only a few semi-independent areas remained outside of Moscow's control, most notably Pskov, which submitted to Moscow's rule in 1510.
The first Tsar was Ivan III's grandson, Ivan IV, more commonly referred to as Ivan the Terrible. He ruled as Grand Prince of Moscow from 1533-1547, and as Tsar from Jan 16, 1547 to 1584. That dynasty ended with Ivan's son Fyodor in 1598, and there was a period of dynastic instability known as the "Time of Troubles" which saw Poland gain control of Russia. In 1613 the Russians chose Mikhail Romanov as Tsar to drive out the Poles. I don't recall exactly how many Romanov Tsars there were, but Nicholas II was the last one when he abdicated in 1917, so the Romanov dynasty lasted over 300 years.

Answer 2

Circa 862 Rurik, a semi-legendary Scandinavian warrior, establishes "Russ" or "Rhos" state at Novgorod