16 Mind-Blowing Things You Didn't Know About Assassin's Creed
13. 'Principessa In Another Castello' Is A Mario Reference
There's a far more overt reference to Mario thrown into AC II when the respective character utters the "It's-a-me!" line, but you might've missed this achievement-based pun, which comes after you meet and escort Lucrezia Borgia after sequence four.
"Thank you Mario, but our Princess is in another castle!" is the line said to everyone's favourite pot-bellied plumber upon completion of the first game in the series.