Her date of birth comes to us from a letter sent by Lord Perceval de Boulainvilliers to the Duke of Milan on July 21, 1429. The relevant passage reads: "On the night of the Epiphany of Our Lord [i.e., January 6], when the people are accustomed to recall most joyfully the acts of Christ, she entered mortal life..." (for a transcription of the original language, see Quicherat's "Procès...", Vol V, p. 116.)
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