Richardson makes no statement regarding the date or place of Philippe's birth. Since she married before 20 July 1399, a broad estimate of her birth year might be 1380, making her about 19 at her marriage.
Her husband was born at Naworth Castle, Cumberland, 27 October 1387. , making him 12 or younger at the time of marriage. This is a reminder that marriages were often arranged as matters of economic and political alliance between families well before the children were of age.
Their second child, Thomas, was born 1410, suggesting that their first child, John, was born 1408, further suggesting that they began living as man and wife in 1407. Her husband, born 1387, would have been 20 that year, and if she were 17, her birth year would be placed as 1390. At this point 1390 appears to be the best estimate for her birth year.
She married Sir Thomas Dacre, 6th Baron Dacre of Gillesland, of Englewood Forest, Cumberland, England, son of Sir William de Dacre, 5th Lord Dacre of Gilsland and Joan de Douglas, before 20 July 1399.
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