Ezio was born alongside fraternal twin Rosalie, to the de Lorraine family in 1746, somewhere outside, but close to, Mortain, France. Neither Ezio nor Rosalie remember which of them was born first, but after a point, it never really mattered. Their family were farmers, keeping livestock and growing grains and sugar beets. Their mother, and later Rosalie, wove together textiles like cotton.
From a startlingly young age, it was clear that something was different about Rosalie, and she wasn't quite a she. At the time, they didn't have too many words for what was different, and while Ezio was patient with her and her ever-changing preferences, most weren't. Ezio got into many an argument with plenty of people over Rose and what she was to be referred to as, and sometimes it got him into trouble. Ezio was nothing if not bullheaded stubborn and determined, however, and while he got into trouble for it time and again, he kept fighting.
Even when no one else did, Ezio would always fight for Rose.
Some years after Ezio and Rose turned sixteen, the local baron, who owned the lands the de Lorraines worked on, took a notable interest in Rose and later asked for her hand in marriage. Ezio knew that Jean Dussault wasn't known for being a kindly man, and he'd had two wives die on him already. Ezio had no interest in Rose being next, and Rose had no interest in being next, either. Rose was too flighty and independent of a personality to make a good spouse anyway, and craved the freedom to do whatever it was that Rose wanted to do.
Ezio gathered some things together, and told Rose to run, saying that Ezio and their parents would follow shortly behind, and that was the plan. Rose ran, Ezio started to gather the family together to leave, and Jean came down on them, and hard. Jean demanded to know where Rosalie had gone, and Ezio knew, but had absolutely no intention of telling Jean that. Jean knew he knew, and beat the ever loving fuck out of him. Ezio refused to tell. Jean set their farms on fire. Ezio refused to tell. Jean shot their father. Ezio refused to tell. Jean poisoned their mother and killed the rest of their livestock.
Ezio had nothing left, and still refused to tell.
Jean decided, Ezio looked just like Rosalie, and would make a decent enough substitute. The goal, of course, was to get Ezio to crack at some point. No one could hold out forever. Ezio was determined to prove him wrong, and it was sheer stubborn and his integrity that kept Ezio standing. He never bowed. He never bent. Jean could unleash all manner of horrors on him all he liked, and still Ezio stood back up straight, looked him in the eyes, and said he'd die before he told Jean where Rose was.
But the more Ezio resisted him, the more Jean pushed him. It was completely unsurprising, because Jean wasn't the sort of man that took to not getting his way very well. Through some fortune, Jean's bastard nephew, Matheo, slipped in and out of their side of the Dussault estate and helped Ezio deal with whatever it was Jean put him through this time.
Jean had placed a barrier around the manor, one intended to keep Ezio in, and little else. Ezio spent a good amount of time trying to figure out how to overcome it, but eventually he gave in. Matheo, not so much. Some six or so years later, after a particularly violent night in which Jean nearly killed Ezio, Matheo managed to break the barrier, and dragged Ezio out of the Dussault manor, and set him on what he figured would be the pathway to Ezio's freedom.
Ezio refused to go. Jean would've killed him if he found out, and Ezio couldn't have that on his conscience. It wasn't to say Ezio liked him, he just didn't dislike him. (Right?) It took some doing, figuring out how to get back, but just like he always was, Ezio was right where he was supposed to be when Jean got home, albeit a little further outside where he was supposed to be, and the barrier was still broken. It was another violent night, that one.
Matheo and Ezio argued in circles, and then Matheo decided something and went to working on breaking the new barrier; it was stronger than the last, go figure. Almost an entire year later, Matheo broke the second one (Dussaults were known for their skill with barriers, and it seemed Matheo was no different), and under cover of night, the two ran together. At first it was aimlessly, but then Ezio redirected them to follow the escape plan Ezio had given Rose, and they reunited at Magic Realm.
Rose wasn't sure what to make of Matheo at first, but Ezio was adamant that he was okay, and Rose eventually backed down, especially after watching the two of them together. Rose, later going by Morgyn, trained under Aine. Ezio took an instant dislike to her, and refused to, opting to train instead under Keisha and figure out Untamed Magic on his own.
Morgyn later became Sage of Untamed Magic. Most thought Ezio might succeed Keisha, but L. did instead, and Ezio's not upset about it. He has bigger problems.
Love is not afraid.