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Gilbert de Clare, 5th Earl of Gloucester

Seal of c.1218-1230 of Gilbert de Clare, 5th Earl of Gloucester, 4th Earl of Hertford.
See the words round the edge saying "Gilbert de Clare, Earl of Hertford".
See full size. From here. From NLW.

Gilbert de Clare, 5th Earl of Gloucester,
and 4th Earl of Hertford.
See wikipedia.
He mar Isabella Marshal [grand-dau of Aoife Mac Murrough].
He died 1230.
5th Earl and Isabella had issue:

1. Richard de Clare, 6th Earl of Gloucester,
   born 1222,
   had issue:
   1. Gilbert de Clare, 7th Earl of Gloucester.

      
      

   2. Thomas de Clare, Lord of Thomond,
      born c.1245.
      He mar 1275 to Juliane Fitzgerald.
      He killed Brian Ruagh O'Brien, King of Thomond in 1277.
      He died 1287.
      Thomas and Juliane had issue:
      1. Maud de Clare, mar Robert Clifford, 1st Baron Clifford and had issue.

      2. Margaret de Clare, mar Bartholemew de Badlesmere and had issue:
         1. Elizabeth de Badlesmere, mar William de Bohun, 1st Earl of Northampton and had issue.

         2. Maud de Badlesmere, mar John de Vere, 7th Earl of Oxford and had issue.

   
   

2. Isabel de Clare, mar Robert le Bruce and had issue.

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• Earl of Gloucester