GAVESTON, 1st Earl of Cornwall Piers
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- 1 GAVESTON, 1st Earl of Cornwall Piers [1] b. 1284 d. 19 Jun 1312
- + DE CLARE, Countess of Gloucester, Countess of Cornwall Margaret b. 12 Oct 1293 d. 9 Apr 1342
- + DE CLARE, Countess of Gloucester, Countess of Cornwall Margaret b. 12 Oct 1293 d. 9 Apr 1342