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Female Joanna de Dammartin (Jeanne of Ponthieu de Dammartin) Click to view Joanna de Dammartin in the family tree

Joanna's father was Count of Ponthieu and Aurnale Simon de Dammartin II and her mother was Countess of Ponthieu & Montreuil Marie de Montgomery de Talvas.  Her paternal grandparents were Count Alberic de Dammartin II and Maud de Clermont; her maternal grandparents were Count of Ponthieu William de Montgomery de Talvas II and Alice Capet. She had two sisters named Philippa and Marie.  She died on March 16th, 1279.1 

Family Details of Joanna's family with Ferdinand (The Saint) of Castile and Leon III

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I7845
Further sources/citations:
http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I4242&style=TABLE, Western Europe in the Middle Ages, 300-1475, Royal Ancestors

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