A new alliance with England was sealed in the 1386 Treaty of Windsor; a year later Joao of Avis married Philippa of Lancaster, the daughter of John of Gaunt.
Joao of Avis never married Philippa of Lancaster, the daughter of John of Gaunt.
mnli hypothesis: Joao of Avis never married Philippa of Lancaster, the daughter of John of Gaunt. premise: A new alliance with England was sealed in the 1386 Treaty of Windsor; a year later Joao of Avis married Philippa of Lancaster, the daughter of John of Gaunt.