Earliest day on which Birth of Benito Juárez can fall, while March 21 is the latest; celebrated on the third Monday of March. (Mexico)
44 BC - Marcus Junius Brutus the Younger and his fellow conspirators, Gaius Cassius Longinus, Decimus Junius Brutus, and several other Roman senators, march to the Capitol following the assassination of Julius Caesar, but there is no response to their appeals to the population, who have left the streets in fear. Caesar's body remains in its place
1819 - French physicist Augustin Fresnel is adjudged the winner of the Grand Prix of the Académie des Sciences for his "Memoir on the Diffraction of Light", which verifies the Fresnel integrals, accounts for the limited extent to which light spreads into shadows, and thereby demolishes Newton's initial objection to the wave theory of light.
1311 - George I Ghisi, Triarch of Euboea, Baron of Chalandritsa, Lord of Tinos, Mykonos, Serifos and Keos