Historically a knight in a plate armour was close to invincible on the battlefield.
Except for uh.. every battle in history that wasn't plate vs peasants? People died all the time I hope you realize. Men-at-arms fought with shit like halberds or warhammers that inflicted severe damage to plate armor, creating blunt traumas and shattering bones by indenting the armor. The poleaxe was actually invented just for this. Swords were for killing peasants.
Tons of kings and other lords have been killed in battle in stupid bullshit ways, and I'm sure they were always in the absolute best gear possible.
Here's a drawing of my nig Richard III (pro heavy cav + hunchback + child murderer CK2 style) owning in the last battle of the War of the Roses, an era where every fucker was in full plate the entire time. He was eventually killed while he was mounted on horseback by a dude wielding a halberd, shattering his helm with a heavy blow. At least he died in a manly cav charge right into the enemy king, killing several other plated fools on his way (probably what this depicts, killing Henry VII's standard bearer)
bIG CaV PLAyZ
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Polydore Vergil, Henry Tudor's official historian, recorded that "King Richard, alone, was killed fighting manfully in the thickest press of his enemies". - pro quotes