Amaury VI de Montfort was the son of the elder Simon de Montfort

Simon de Montfort, 5th Earl of Leicester

Simon IV de Montfort, Seigneur de Montfort-l'Amaury, 5th Earl of Leicester , also known as Simon de Montfort the elder, was a French nobleman who took part in the Fourth Crusade and was a prominent leader of the Albigensian Crusade...

 and Alice of Montmorency, and the brother of the younger Simon de Montfort

Simon de Montfort, 6th Earl of Leicester

Simon de Montfort, 6th Earl of Leicester, 1st Earl of Chester , sometimes referred to as Simon V de Montfort to distinguish him from other Simon de Montforts, was an Anglo-Norman nobleman. He led the barons' rebellion against King Henry III of England during the Second Barons' War of 1263-4, and...

.

He participated in the Albigensian Crusade

Albigensian Crusade

The Albigensian Crusade or Cathar Crusade was a 20-year military campaign initiated by the Catholic Church to eliminate Catharism in Languedoc...

 under his father's command. He inherited the County of Toulouse

Counts of Toulouse

The first Counts of Toulouse were the administrators of the city and its environs under the Merovingians. No succession of such royal appointees is known, though a few names survive to the present...

 (that his father had taken from Raymond VI of Toulouse

Raymond VI of Toulouse

Raymond VI was count of Toulouse and marquis of Provence from 1194 to 1222. He was also count of Melgueil from 1173 to 1190.-Early life:...

 as a reward for his role in the Crusade) when his father died; he had to give up the territory to King Louis VIII

Louis VIII of France

Louis VIII the Lion reigned as King of France from 1223 to 1226. He was a member of the House of Capet. Louis VIII was born in Paris, France, the son of Philip II Augustus and Isabelle of Hainaut. He was also Count of Artois, inheriting the county from his mother, from 1190–1226...

 in 1224. In 1230 Amaury became constable of France

Constable of France

The Constable of France , as the First Officer of the Crown, was one of the original five Great Officers of the Crown of France and Commander in Chief of the army. He, theoretically, as Lieutenant-general of the King, outranked all the nobles and was second-in-command only to the King...

, an office previously held by his uncle Mathieu II of Montmorency. In 1239 he participated in the Crusade of 1239 and was taken prisoner after the defeat at Gaza

Gaza

Gaza , also referred to as Gaza City, is a Palestinian city in the Gaza Strip, with a population of about 450,000, making it the largest city in the Palestinian territories.Inhabited since at least the 15th century BC,...

. He was imprisoned in Cairo

Cairo

Cairo , is the capital of Egypt and the largest city in the Arab world and Africa, and the 16th largest metropolitan area in the world. Nicknamed "The City of a Thousand Minarets" for its preponderance of Islamic architecture, Cairo has long been a centre of the region's political and cultural life...

 and was freed in 1241, but died the same year in Otranto

Otranto

Otranto is a town and comune in the province of Lecce , in a fertile region once famous for its breed of horses.It is located on the east coast of the Salento peninsula. The Strait of Otranto, to which the city gives its name, connects the Adriatic Sea with the Ionian Sea and Italy with Albania...

 while on the journey home. His wife was Beatrice of Burgundy and their son was Jean I de Montfort

Jean I de Montfort

Jean I de Montfort , Comte de Montfort from 1241 to 1249, son of Amaury VI, comte de Montfort, and of Béatrice de Bourgogne.In March 1248 he married Jeanne de Châteaudun, dame de Château-du-Loir, daughter of Geoffroy VI, vicomte de Châteaudun, and of Clémence des Roches...

.

Amaury (or Amalrik) was married to Beatrix (1205–1248), daughter of Guigues VI of Viennois

Guigues VI of Viennois

Andrew Guigues VI , known as André de Bourgogne, Dauphin of Viennois, was the Count of Albon, Briançon, Grenoble, and Oisans from 1228 until his death. He was the son of Hugh III of Burgundy and Béatrice of Albon...

, en was the father of:

• Jan I (-1249), married to Johanna, daughter of Viscount
  Viscount
  A viscount or viscountess is a member of the European nobility whose comital title ranks usually, as in the British peerage, above a baron, below an earl or a count .-Etymology:...
  
   Godfried VI of Châteaudun
• Laura (-1270), married to Ferdinand (1239–1260) Count of Aumale
• Margaretha, married to Jan III of Soissons
• Adelheid (1220–1280), married to Simon of Nesle (1220–1288).