Khajiit assassin, the perfect combination.
Spellsword class in Oblivion has Heavy Armor but not Conjuration as major skill. In Morrowind they had Medium Armor instead. Both have Destruction as major skill. Personally i play the class as a tank that uses magic to improve defense and offense.
Oh, fair enough...
heavy armor and magic, sorcerer. That's not a battlemage, as far as I know.
See, it's the definition of a battlemage for me! I guess this shows how little class names mean, seeing as everyone has different ideas for how to name a certain playstyle. That's why I loved being able to name your "class" in Oblivion - if the name sounded right for me then that's what I'd call it.