Simon de Montfort or Simon de Montford may refer to:
- Simon I de Montfort (c. 1025–1087), French nobleman, an ancestor of the following
- Simon de Montfort, 5th Earl of Leicester (1160–1218), French nobleman, achieved prominence in the Fourth Crusade and in the Albigensian Crusade
- Simon de Montfort, 6th Earl of Leicester (1208–1265), son of the 5th Earl, a powerful English baron, led a revolt against King Henry III of England, called the first elected parliament
- Simon VI de Montfort "the younger" (1240-1271), second son of the 6th Earl
- Simon de Montford English nobleman executed in 1495, unrelated to the above.
Famous quotes containing the words simon de and/or simon:
“Given for one instant an intelligence which could comprehend all the forces by which nature is animated and the respective positions of the beings which compose it, if moreover this intelligence were vast enough to submit these data to analysis, it would embrace in the same formula both the movements of the largest bodies in the universe and those of the lightest atom; to it nothing would be uncertain, and the future as the past would be present to its eyes.”
—Pierre Simon De Laplace (1749–1827)
“Given for one instant an intelligence which could comprehend all the forces by which nature is animated and the respective positions of the beings which compose it, if moreover this intelligence were vast enough to submit these data to analysis, it would embrace in the same formula both the movements of the largest bodies in the universe and those of the lightest atom; to it nothing would be uncertain, and the future as the past would be present to its eyes.”
—Pierre Simon De Laplace (1749–1827)