Philippa (Portuguese: Filipa) was born on 31 March 1360, in Leicester. She was the oldest child of John of Gaunt, 1st Duke of Lancaster and his wife, Blanche of Lancaster. Philippa spent her infancy moving around the properties owned by her family with her mother and her wet-nurse, Maud. She was raised and educated with alongside her two siblings, Elizabeth and Henry. Blanche of Lancaster died of plague in 1369 and, in 1371, her father remarried: the chosen wife was Infanta Constance of Castile. In 1394, Constance died and John of Gaunt remarried yet again, this time to his mistress, Katherine Swynford (Katherine had been Philippa's governess). This affair and eventual marriage was considered scandalous. Katherine Swynford seems to have been well liked by Philippa and her siblings; she played an important role in Philippa's education. Katherine was related to Geoffrey Chaucer, since her sister (also called Philippa) was his wife. John of Gaunt became Chaucer's pat...