 If you liked
Rakudai Kishi no Cavalry
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 ...then you might like
Saijaku Muhai no Bahamut
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Both manga take place in midieval times and in a special academy, unrelated to teaching normal studies. Both mc are famous for being the weakest yet the strongest of all (you'll get it once you read them) that come from good and throughly known families. Also, both female mc are (conceited) princesses from noble families and the top students of the academy that want to become the best/strongest. Finally, both manga start by having the the two main characters being challenged (by the girls) into a duel.
And of course the're both very interesting! ^_^