▁Mont fort ▁was ▁a ▁medieval ▁French ▁noble ▁house ▁that ▁eventually ▁found ▁its ▁way ▁to ▁the ▁Kingdom ▁of ▁England ▁and ▁origin ated ▁the ▁famous ▁Simon ▁de ▁Mont fort , ▁ 6 th ▁Earl ▁of ▁Le ic ester . ▁ ▁The ▁family ▁began ▁when ▁Hugh ▁Cap et ▁a ▁granted ▁pet ty ▁lord ship ▁to ▁Guillaume ▁de ▁Mont fort ▁in ▁the ▁Î le - de - France . ▁His ▁success ors ▁were ▁to ▁be ▁the ▁v ass als ▁of ▁the ▁counts ▁of ▁Be aum ont . ▁Guillaume ' s ▁son , ▁Ama ury ▁began ▁building ▁a ▁castle ▁that ▁would ▁eventually ▁become ▁the ▁e pon ym ous ▁Mont fort - l ' A ma ury . ▁The ▁project , ▁however , ▁was ▁incomplete ▁when ▁he ▁died ▁circa ▁ 1 0 5 3 , ▁but ▁his ▁son , ▁Simon ▁was ▁able ▁to ▁finish ▁it ▁in ▁ 1 0 6 7 . ▁His ▁great - grand son , ▁Simon ▁IV ▁would ▁eventually ▁marry ▁the ▁he ir ess ▁of ▁Le ic ester ▁and ▁their ▁son , ▁Simon ▁V ▁would ▁become ▁the ▁first ▁Mont fort ▁ear l ▁of ▁Le ic ester . ▁ ▁During ▁the ▁ 1 3 th ▁century ▁the ▁family ▁lost ▁their ▁ancest ral ▁seat ▁of ▁Mont fort - l ' A ma ury ▁to ▁the ▁House ▁of ▁Dre ux . ▁ ▁Gene al ogy ▁ ▁Guillaume ▁ ▁Ama ury ▁I ▁ ▁Simon ▁I ▁ ▁Ama ury ▁II ▁ ▁Isabel ▁ ▁Bert rade ▁ ▁Richard ▁ ▁Simon ▁II ▁ ▁Ama ury ▁III ▁ ▁Ama ury ▁IV ▁ ▁Simon ▁III