Denis (, ; Lisbon, 9 October 1261 – Santarém, 7 January 1325), called the Farmer King (Rei Lavrador) and the Poet King (Rei Poeta), was King of Portugal and the Algarve. The eldest son of Afonso III of Portugal by his second wife, Beatrice of Castile, and grandson of king Alfonso X of Castile (known as the Wise), Denis succeeded his father in 1279. His marriage to Elizabeth of Aragon, who was later canonised as a saint of the Roman Catholic Church, was arranged in 1281 when she was 10 years old.