Question: What is the date of birth of Isabella Of France's mother?
Sentence (from "Joan I of Navarre"): Joan I (14 January 1273 – 31 March/2 April 1305)  was queen regnant of Navarre and countess of Champagne from 1274 until 1305; she was also queen consort of France by marriage to Philip IV of France.
Relevant evidence: Yes