Ehem... Quite many of your examples are from different centuries... But what really wonders me is why Casimir IV is there ?
If it is the same Casimir IV of Poland-Lithuania I am thinking about he was rather lousy commander, ar rather didn't fight at all and left that work to other people.
Sure his reign marked the end of feudal army in Poland (was professional after that), but the only reason seem his defeat at Chojnice and inability to convince anyone to fight without paying them.
Actually for Poland I wouldn't dare to find a single really good commander from that time - simply too few battles were fought and those were usually works of different people - noone responsible for more than one victory.
As for some my proposals. Janos Hunyadi, Skandenberg, Michael the Great for sure.
The rest is already mentoned by other people.
???? Any reason for that ?
Sure he was wearing a cool white uniform with black crosses here and there, but his military achivements are most likely limited to one campaign in 1410 where he failed utterly - was killed and almost brought the end of the Teutonic Order which never recovered anyway from that loss.
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