1848: The signing of the Treaty of Guadalupe Hidalgo marks the end of the mexico war (1846-1848) which opposes Mexicans and Americans. Defeated, the Mexicans were forced to cede Texas, California and New Mexico.
1076: Beginning of querelle of investitures, which opposes the Pope and the Germanic Emperor on the subject of the appointment of prelates of the Church.
661: theassassination of Ali, son-in-law of the Prophet Muhammad opens a schism in the Muslim world between Sunnis and Shiites.
41: Theemperor Caligula, great-grandson of Antoine, is assassinated by soldiers of the Praetorian Guard, much to the relief of the Romans.