What did Ivan I do?

Answer 1

Ivan I, also known as Ivan Kalita, was the Grand Prince of Moscow from 1325 to 1340. He is notable for consolidating power in Moscow and enhancing its status as a political center by gaining the favor of the Mongol rulers, which allowed him to collect tribute on their behalf. His reign marked the beginning of Moscow's rise as a dominant force in Russia, laying the groundwork for future expansion. Ivan I was also instrumental in developing the administration and strengthening the economy of the principality.