Template:On this day - May 30

Fadrique Álvarez de Toledo y Mendoza

• 1108 – The Christian troops of Alfonso VI are defeated at the Battle of Uclés (Cuenca, present-day Spain) by the Almoravids of Granada, Valencia and Murcia, led by Yusuf ibn Tashfin.
• 1252 – Death of Ferdinand III the Saint, King of Castile (present-day Spain) (b. 1199).
• 1379 – Death of Henry II of Castile, King of Castile (present-day Spain) (b. 1333).
• 1498 – From Sanlúcar de Barrameda (Spain), Christopher Columbus's third voyage to the American continent begins.
• 1516 – In the Kingdom of Aragon, Charles I of Spain is named heir to the throne after the death of his grandfather Ferdinand the Catholic.
• 1539 – In Florida (present-day United States), the conquistador Hernando de Soto lands in Tampa Bay with 600 soldiers.
• 1574 – In the Banda Oriental of the Viceroyalty of Peru (present-day Uruguay), the adelantado Juan Ortiz de Zárate founds the village of San Salvador, today Dolores.
• 1580 – Birth of Fadrique Álvarez de Toledo y Mendoza, Spanish military officer and politician (d. 1634).
• 1640 – Death of Pieter Pauwel Rubens, Flemish Baroque painter, favorite of King Philip IV of Spain, who was his main client (b. 1577).
• 1815 – José Gaspar Rodríguez de Francia has himself proclaimed perpetual dictator and head of the church of Paraguay.
• 1848 – The United Mexican States ratify the Treaty of Guadalupe Hidalgo, signed earlier to end the Mexican–American War, officially ceding present-day California, Nevada, Utah and other territories inherited from the Spanish Empire to the United States of America.
• 1845 – Birth of Amadeo of Savoy, elected King of Spain by the Cortes Generales in 1870 after the dethronement of Isabella II (d. 1890).
• 1895 – The Cuban poet José María de Heredia is accepted into the French Academy.
• 1928 – In Nicaragua the Nicaraguan Academy of the Language is founded.
• 1934 – The United States eliminates the Platt Amendment and officially grants independence to Cuba, although it continues to exercise iron control over the political and military establishment of the island.
• 1935 – Bolivia accepts a thirty-day truce in the Chaco War, thanks to the mediation of Argentina and Brazil.
• 1961 – Assassination of Rafael Trujillo, Dominican military officer and dictator (b. 1891).
• 1969 – In Gibraltar the new Constitution comes into force, by which the British Empire grants the Rock self-government, although it continues to exercise iron control over the political and military establishment of the Rock.
• 1982 – Spain becomes the 16th member of NATO (North Atlantic Treaty Organization).
• 1983 – In Spain, the Canary Islands hold their first parliamentary session in Santa Cruz de Tenerife, an event remembered every year with the celebration of Canary Islands Day.
• 1996 – The Supreme Court of Justice of Venezuela sentences former president Carlos Andrés Pérez for "aggravated generic embezzlement" to two years and four months of house arrest.
• 2014 – In La Paz, administrative capital of Bolivia, the Mi Teleférico transport system begins operations, linking it with neighboring El Alto (Bolivia's second most populous city).
• 2018 – In Nicaragua, the Mother's Day Massacre occurs in the cities of Estelí, Chinandega, Managua and Masaya.