Editing Richard of Cornwall (section)

===Marriage to Isabel, 1231–1240===
In March 1231, he married [[Isabel Marshal]], the wealthy widow of the [[Gilbert de Clare, 5th Earl of Gloucester|Earl of Gloucester]], much to the displeasure of his brother King Henry, who feared the Marshal family because they were rich, influential, and often opposed to him, as did Richard by this point. The joining of Richard to the Marshal family increased the power behind these rebellions, and the potential risk for Henry. Richard became stepfather to Isabel's six children from her first husband. In that same year he acquired his main residence, [[Wallingford Castle]] in Berkshire (now [[Oxfordshire]]), and spent much money on developing it. He had other favoured properties at [[Marlow, Buckinghamshire|Marlow]] and [[Cippenham]] and was a notable [[lord of the manor]] at [[Princes Risborough|Earls Risborough]], all in Buckinghamshire.

Isabel and Richard had four children, of whom only their son, [[Henry of Almain]], survived to adulthood. Richard opposed [[Simon de Montfort, 6th Earl of Leicester|Simon de Montfort]] and rose in rebellion in 1238 to protest against the marriage of his sister, [[Eleanor of England, Countess of Leicester|Eleanor]], to Simon. Once again he was placated with rich gifts. When Isabel was on her deathbed in 1240, she asked to be buried next to her first husband at [[Tewkesbury]], but Richard had her interred at [[Beaulieu Abbey]] instead. As a pious gesture, however, he sent her heart to Tewkesbury.