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^"Robert, first earl of Gloucester". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/23716. (Subscription or UK public library membership required.)
^Connolly, Sharon Bennett. "Isabella of Gloucester, the Lost Queen of England". History The Interesting Bits. Archived from the original on 5 December 2019. Retrieved 2 September 2020.
^"Clare, Gilbert de, fifth earl of Gloucester and fourth earl of Hertford". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/5437. (Subscription or UK public library membership required.)
^"Clare, Richard de, sixth earl of Gloucester and fifth earl of Hertford". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/5448. (Subscription or UK public library membership required.)
^"Clare, Gilbert de [called Gilbert the Red], seventh earl of Gloucester and sixth earl of Hertford". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/5438. (Subscription or UK public library membership required.)
^"Clare, Gilbert de, eighth earl of Gloucester and seventh earl of Hertford". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/5439. (Subscription or UK public library membership required.)
^"Monthermer, Ralph de, first Lord Monthermer". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/19078. (Subscription or UK public library membership required.)
^"Audley, Hugh, earl of Gloucester". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/37134. (Subscription or UK public library membership required.)