The Battle of Trancoso was fought on 29 May 1385^[2] between the Kingdom of Portugal and the Crown of Castile.

Following the coronation of João of Aviz, John I of Castile sent an army into the Portuguese region of Beira in retaliation for Portuguese defiance, where they committed all the kinds of atrocities.^[3] The city of Viseu was pillaged and burned,^[4] but when the Castilians were returning to Castile with their plundered loot and the prisoners they had taken, a Portuguese army met them, dismounted and assumed a defensive formation. The Castilians exhausted themselves in attack but ended up being utterly routed,^[5][6] with very high casualties among their ranks, and with six of their seven captains killed.^[7] The Portuguese released all those taken captive by the Castilians and recovered all the pillage taken from their towns.^[8]

• History of Portugal
• House of Avis
• Nuno Álvares Pereira
• Hundred Years War

• Jean Froissart, Sainte-Palaye (Jean-Baptiste de La Curne, M. de La Curne de), Chronicles of England, France, Spain, and the adjoining countries,: from the latter part of the reign of Edward II. to the coronation of Henry IV. (1839)
• João Gouveia Monteiro, Aljubarrota-1385-A Batalha Real (2003) ISBN 972-8799-04-7
• Pereira Felix, Abridgement of the History of Portugal (2009)
• H. V. Livermore, A new History of Portugal (1966)
• H. Morse Stephens, Portugal A History (1891) ISBN 978-1-4400-8356-3