Template:On this day - June 20

Juan Domingo Perón

• 1333 – Marinid and Nasrid armies attack and recover the Andalusi city of Gibraltar (present-day United Kingdom).
• 1500 – In Seville (Spain), Queen Isabella the Catholic, by a Royal Decree, prohibits slavery, considering the American indigenous peoples as subjects of the Crown with the same obligations and rights as the rest of the Spaniards.
• 1811 – The Battle of Huaqui takes place, in which the Royal Army of Peru defeated the army of the River Plate provinces, causing the definitive split between the Río de la Plata and Upper Peru.
• 1820 – Death of Manuel Belgrano, Argentine lawyer, economist, journalist, politician, diplomat and military officer who played a prominent role in the wars of independence of present-day Bolivia, Argentina and Paraguay.
• 1898 – In the Captaincy General of the Philippines, the Capture of Guam by the United States takes place, in the context of the Spanish–American War.
• 1933 – In the Caribbean Sea, the Spanish aviators Mariano Barberán and Joaquín Collar, who had crossed the Atlantic aboard the Cuatro Vientos, leave Havana for Mexico and disappear on the way.
• 1908 – Death of Federico Chueca, Spanish composer (b. 1846).
• 1910 – Birth of Juan de Borbón, Count of Barcelona, head of the Royal House of Spain in exile from 1941 to 1977 (d. 1993).
• 1949 – In Argentina, constitutional president Juan Domingo Perón decrees that the national universities of that country be free of charge, both for Argentine nationals and for those of the other Latin American countries. That law remains in force to this day.
• 1961 – In Argentina, the Argentine guerrilla fighter and physician Ernesto Che Guevara (then serving as Cuba's Minister of Industry) visits president Arturo Frondizi.
• 1973 – Former constitutional president Juan Domingo Perón returns to Argentina after 18 years in exile. Near Ezeiza International Airport, during the welcome for the leader, the Ezeiza massacre occurs, in which snipers fire on his supporters, killing at least 13 and wounding more than 300.
• 1989 – Death of Juan de Mata, Spanish historian and archaeologist (b. 1899).
• 2018 – Death of Dante Caputo, Argentine diplomat, academic and politician (b. 1943).