Montfort-l'Amaury

Département : Yvelines

Official blazon

Origin/meaning

The white lion on a red field is the coat-of-arms of the Montfort family. An old noble family whose root extented well into the middle ages.

The chief of Ermine is a reference to the fact that Jean V, Count of Montfort became undisputed Duke of Brittany after winning the Breton War of Succession of 1341-64. (A part of the early Hundred Years War between France and England.)
The ermine coat-of-arms of the Dukes of Bretagne was borne as arms of dominion in place of own arms by whatever family that held the duchy.