The Battle of Alfarrobeira took place on May 20, 1449. It was a confrontation between the forces commanded by king Afonso V of Portugal and his uncle Afonso, Duke of Braganza, against the army of the rebellious Pedro, Duke of Coimbra. The place was Alverca, near Lisbon, at the margins of the creek of Alfarrobeira. The result was the definite defeat and death of the duke of Coimbra and the establishment of the Bragança as the most powerful house of Portugal. May 20 is the 140th day of the year in the Gregorian Calendar (141st in leap years). ... Events January 6 - Constantine XI is crowned Byzantine Emperor. ... Afonso V of Portugal, the African, thirteenth king of Portugal was born in Sintra in January 15, 1432 and died in the same city in August 28, 1481. ... May 20 is the 140th day of the year in the Gregorian Calendar (141st in leap years). ... Events January 6 - Constantine XI is crowned Byzantine Emperor. ... Afonso V of Portugal, the African, thirteenth king of Portugal was born in Sintra in January 15, 1432 and died in the same city in August 28, 1481. ... Lisbon (in Portuguese, Lisboa) is the capital and largest city of Portugal. ... The Duchy of Bragança or Braganza is one of the most important titles of the Portuguese Royal Family. ...