That reference to Carisbrooke reminded me that in her widowhood Philippa Duchess of York described herself as 'Lady of the Isle of Wight'. That in turn prompted me to do a bit of googling, and find her will. It's quite interesting for a short will - I'm pretty sure the man she describes as her 'son' was actually her stepson, and probably the guy who challenged Edward to single combat.
By the way, if you ever fancy visiting Philippa, her tomb is in Westminster Abbey. (Arguably, the best tomb of the whole family in that generation. Constance's is destroyed, Edward's is a crummy Elizabethan replacement at Fotheringhay, and poor old Richard of Conisbrough having been executed as a traitor never had a proper tomb as far as I know.)