Template:On this day - March 12

Sisenand

• 636 – Death of Sisenand, King of Visigothic Hispania (b. 605).
• 1254 – Under the patronage of King Alfonso the Wise, Yehuda ben Moshe begins in Toledo the translation of the so-called Libro complido de los juizios de las estrellas, a treatise of astrology on the influence of the planets on people's lives, written by Abenragel in 1037.
• 1354 – Peter IV of Aragon founds the Sertorian University of Huesca.
• 1535 – Captain Francisco Pacheco founds the city of Puerto Viejo, the first to be established on the coast of present-day Ecuador.
• 1550 – The Battle of Penco takes place, fought in the Arauco War between about 500 soldiers and allies under Pedro de Valdivia and some 80,000 Mapuche warriors of Toqui Ainavillo, with victory for the former.
• 1595 – In Tolima (New Kingdom of Granada, present-day Colombia), the Nevado del Ruiz volcano erupts, leaving 636 victims.
• 1622 – Ignatius of Loyola, founder of the Jesuits, and Teresa of Jesus, foundress of the Discalced Carmelites, are made saints by the Catholic Church.
• 1648 – Death of Tirso de Molina, playwright, poet and prose writer of the Spanish Baroque (b. 1579).
• 1730 – Death of Diego Morcillo Rubio de Auñón, Spanish Trinitarian friar and Viceroy of Peru (b. 1642).
• 1732 – A Royal Order issued in Seville authorizes the establishment of the Government of Sonora and Sinaloa in New Spain under a Governor and Captain general.
• 1787 – Death of Vicente García de la Huerta, Spanish poet and playwright (b. 1734).
• 1833 – During the Carlist Wars, the combat of Larremiar (Navarre) takes place, in which Espoz y Mina and Zumalacárregui face each other.
• 1853 – Death of Mateo Orfila, Spanish scientist, known as the "father of scientific toxicology" (b. 1787).
• 1906 – Death of Manuel Quintana, lawyer, politician and President of Argentina (b. 1835).
• 1948 – In Costa Rica, the civil war breaks out, provoked by the annulment of the presidential elections in which Otilio Ulate Blanco had been elected.
• 1958 – The attacks by Moroccan armed bands of the Istiqlal Party against the Spanish garrisons of Ifni (present-day Morocco) come to an end.
• 1977 – Rutilio Grande, considered the first Jesuit martyr of the Civil War in El Salvador, is murdered in El Salvador.
• 1986 – Spanish citizens vote "yes" in a referendum on the country's entry into NATO.
• 1990 – Launch of the oceanographic research vessel Hespérides, operated by Spain's Spanish National Research Council (CSIC).
• 2010 – Death of Miguel Delibes, writer and journalist, member of the Royal Spanish Academy (b. 1920).
• 2019 – Death of José Alzuet, Spanish painter and ceramist (b. 1928).
• 2024 – Death of Sergio Giral, Cuban film director (b. 1937).