In the 1230s or the 1240s, Yaroslav Vsevolodovich, the Grand Prince of Vladimir, detached the city of Tver from Principality of Pereyaslavl-Zalessky where it previously belonged and gave it to his son Alexander Nevsky. In 1246, another son of Yaroslav, Yaroslav of Tver, became the Prince of Tver, and the principality was ruled by his descendants until 1485, when it was abolished. In 1264, Yaroslav was appointed the Grand Prince of Vladimir, which at the time meant he was the supreme authority of all north-western Russia. In the 13th century, Principality of Tver was less dependent from the Golden Horde than other Russian principalities were, and its population grew up. The combination of these two factors led to the rivalry between Tver and Moscow, each of which were trying to become the most influential Russian principality.
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