Honorable mention goes to Dmitry Donskoi.
Please, not that one! To start with, he was not even in charge of a single significant battle he is credited with and, AFAIK, there are serious doubts about that battle even being fought, or being fought in an alleged site, or involving alleged numbers of people, or having any significance at all.
The 2nd big Russian national hero of that type also has significant problems. (a) it had been claimed that the Swedish chronicles have no record of the alleged expedition of Jarl Birger of 1240 against Novgorod, not to mention any kind of a battle with a related injury, (b) it was said that initially nickname "Nevsky" was attributed to a different Alexander, (c) famous battle on Lake Peipus seems to be blown out of proportion both in the terms of the forces involved and casualties (20 Livonian knights dead, 6 captured, nothing about those drowning; in Russian chronicle total 50 "Germans" captured) and the popular "reconstruction" of the battle is based on a pure ignorance: those doing "interpretation" were unaware of the rules of the Russian art of the period and mistook a preliminary stage of a campaign (marching troops) for a battlefield reserve. Actually, his sainthood had been granted not for the military activities but for an active collaboration with Batu and Berke which prevented Mongolian persecutions of the rebels (in the case of Novgorod, Alexander handled persecutions himself). Of course, the fact that he was a founder of the dynasty of the Muscovite rulers had absolutely nothing to do with anything.