This victory allowed Prince John to use the Canary Islands as an exchange coin in the peace treaty of Alcáçovas. ↑ ↓ Pina, Chronica de El-Rei D. Affonso Vu200b, 3rd book, chapter CXCIV (Editorial error: Chapter CXCIV erroneously appears as Chapter CLXIV.Reports the end of the siege of Ceuta by the arrival of the fleet with Afonso V). ↑ ↓ Quesada, Portugueses en la frontera de Granadau200b, 2000, p.