William III de Forz, 4th Earl of Albemarle (died 1260) (Latinised as de Fortibus) played a conspicuous part in the reign of Henry III of England

Henry III of England

Henry III was the son and successor of John as King of England, reigning for 56 years from 1216 until his death. His contemporaries knew him as Henry of Winchester. He was the first child king in England since the reign of Æthelred the Unready...

, notably in the Mad Parliament of 1258.

He married:

1. Christina (d. 1246), daughter and co-heiress of Alan, Lord of Galloway
   Alan, Lord of Galloway
   Alan Fitz Roland was the last of the MacFergus dynasty of quasi-independent Lords of Galloway. He was also hereditary Constable of Scotland.-Family:He was the son of Roland, or Lochlann, Lord of Galloway and Helen de Morville...
   
   
2. in 1248 Isabella de Redvers
   Isabella de Fortibus
   Isabella de Fortibus was the eldest daughter of Baldwin de Redvers, 6th Earl of Devon. At the age of 11 or 12 she became the second wife of William de Fortibus who owned land in Yorkshire and Cumberland and was the count of Aumale in Normandy. When he died in 1260 part of his estates were...
   
    (1237–1293), daughter of Baldwin de Redvers, Earl of Devon and Lord of the Isle of Wight
   Isle of Wight
   The Isle of Wight is a county and the largest island of England, located in the English Channel, on average about 2–4 miles off the south coast of the county of Hampshire, separated from the mainland by a strait called the Solent...
   
   .

William de Forz died at Amiens

Amiens

Amiens is a city and commune in northern France, north of Paris and south-west of Lille. It is the capital of the Somme department in Picardy...

. His widow, Isabella, on the death of her brother Baldwin de Redvers, 8th Earl of Devon, in 1261, called herself Countess of Devon. She had six children, all of whom pre-deceased her, including Thomas, who died in 1269 unmarried, and Avelina

Aveline de Forz

Aveline de Forz , Countess of Aumale and Lady of Holderness, was a British noble.Aveline was born at Burstwick in Holderness to William de Forz, 4th Earl of Albemarle and Isabella de Fortibus, Countess of Devon. In 1269, she married Edmund Crouchback, the second son of Henry III of England, at...

, who married Edmund Crouchback, 1st Earl of Lancaster

Edmund Crouchback, 1st Earl of Lancaster

Edmund of Crouchback, 1st Earl of Leicester and Lancaster , was the second surviving son of King Henry III of England and Eleanor of Provence. In his childhood he had a claim on the Kingdom of Sicily. His nickname refers to his participation in the Ninth Crusade.-Childhood:Edmund was born in London...

 in 1269, and died without issue in 1274, aged 15.

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