Note 17.1
One source for the speculation that Agatha Ferrers was Joan's mother is Sir William Dugdale, in The Baronage of England (1675-6). He states his source to be Dr David Powel's History of Wales (1584). Powel's work is an enlarged edition of H Lhoyd's translation of The Historie of Cambria by the twelfth century Saint Caradoc of Llancarfan.
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