 If you liked
Code Geass: Hangyaku no Lelouch
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 ...then you might like
Ginga Eiyuu Densetsu Gaiden (1999)
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In Both the hero is nobility. Lelouch was a discarded prince while Reinhard was a poor noble. But both want to remove the nobility from power. Both have grand plans to unify the world for the sake of their sisters. Both are charismatic and have strong allies and enemies. Both are Genius military guys and will make sacrifices for the grand dream.