Philippa of Lancaster was Queen of Portugal from 1387 until 1415 as the wife of King John I. Born into the royal family of England, her marriage secured the Treaty of Windsor and produced several chil

John I, also called John of Aviz, was King of Portugal from 1385 until his death in 1433. He is recognized chiefly for his role in Portugal's victory in a succession war with Castile, preserving his c