Thomas Andrew Archer, Dictionary of National Biography… (1887)
“ Gilbert de Clare was the most powerful English noble of his day. Besides his immense estates in Wales and Ireland, he possessed lands in twenty-two English counties (Escheat Rolls, i. 131) . In his early years he appears to have been very fickle in his political attachments, and want of loyalty to his leaders was strikingly exemplified in his conduct towards Simon de Montfort and Prince Edward. There was something chivalrous, however, in his attitude towards the disinherited barons, and in his care to secure the safety of his adherents among the London citizens. ”
