Background
She was the elder daughter of Ulrich III of Pfirt and his wife, Joanna of Burgundy. Reginald was the son of Hugh III, Count of Burgundy and his wife Adelaide, Countess Palatine of Burgundy. Adelaide was daughter of Otto I, Duke of Merania and his wife Beatrice II, Countess of Burgundy.
Beatrice was a daughter of Otto I, Count of Burgundy and his wife Margaret, Countess of Blois.
Margaret was a daughter of Theobald V, Count of Blois and Alix of France. Alix herself was the daughter of Louis VII of France and his famous first wife, Eleanor of Aquitaine, who later married Henry II of England and was mother to two Kings of England, Richard and John.
When Reginald of Burgundy died in 1322, his daughter, Joanna (Joanna of Pfirt"s mother) inherited her father"s domains.