User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-4136513-20141001193932/@comment-24595865-20141001201536

Well, we know that he was framed for the murder of François de la Serre, the Templar Grand Master who raised him, so that's probably how he ended up there. It doesn't look like they're in the Bastille, because when he looks out the window you can see people on the street just below.