Walchelin was the son of Henry de Ferrieres, a nephew of Robert de Ferrers, 1st Earl of Derby.
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In February, Robert de Ferrers, Earl of Derby was arrested and imprisoned in the Tower.
In 1263, during the baronial revolt of Simon de Montfort, the rebel Robert Ferrers, earl of Derby led an attack on Worcester.
Following the capture of Robert de Ferrers, 6th Earl of Derby in 1266, following his rebellion against King Henry III, de Ferrers' lands and estates were confiscated; the associated from 1266 documents reveal there was a preceptory and leper hospital of the Order of St Lazarus at Locko, dedicated to St Mary Magdalene.
He is on record during May and June as taking the 'Three Castles'—Grosmont, Skenfrith, and Whitecastle in South Wales, which belonged to Prince Edward.
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In 1249, at the age of 10, he married the seven-year-old Mary (or Marie), daughter of Hugh XI of Lusignan Count of La Marche, the eldest of Henry III's half-brothers, at Westminster Abbey.