Mikhail Alexandrovich was Grand Prince of Tver and briefly held the title of Grand Prince of Vladimir.
Background
He was one of only two Tver princes after 1317 (the other was his father, Aleksandr) to hold the grand princely title, which was almost the exclusive purview of the Muscovite princes. Mikhail Alexandrovich was the third son of Aleksandr Mikhailovich of Tver.
Career
Mikhail grew up in Pskov, where his father had fled after the Tver Uprising of 1327. He was christened by the Archbishop of Novgorod, Vasily Kalika, in 1333. Five years later, he and his mother were called to Tver when Aleksandr returned to the city.
In 1341, he went to Novgorod where Archbishop Vasily taught him reading and writing (which would have meant reading the Scriptures).
In 1368, he became prince of Tver. In 1371, he managed to gain the yarlik or patent of office as Grand Prince of Vladimir from the Khan of the Golden Horde, and was accepted as Prince of Novgorod, an important economic asset for any Russian prince.
He seems to have lost power the following year when Algirdas concluded Treaty of Lyubutsk with Dmitri Donskoi of Moscow, but it is not clear who was considered grand prince between 1372 and 1375, at which time Dmitri Donskoi defeated Mikhail.