March 15 in History

Twenty-three stab wounds. The most powerful man in the Roman Republic bled out at the base of Pompey's statue on the Ides of March, 44 BC, killed by men he had pardoned, promoted, and trusted. Julius Caesar's assassination was not a spontaneous act of rage but a carefully planned conspiracy involving at least sixty senators who believed they were saving the Republic from tyranny. Caesar had been declared dictator perpetuo, dictator in perpetuity, just weeks before his death. He had defeated his rivals in a civil war, absorbed the powers of multiple magistracies, and placed his portrait on Roman coins, a privilege previously reserved for gods. The Senate granted him the right to wear a purple toga, sit on a gilded chair, and have a temple dedicated to his clemency. To his enemies, every honor confirmed their fear: Caesar intended to make himself king. The conspirators gathered at the Theatre of Pompey, where the Senate was meeting while the Curia was under renovation. As Caesar took his seat, Lucius Tillius Cimber approached with a petition. When Caesar waved him away, Cimber grabbed his toga, the signal for the attack. Casca struck first, slashing at Caesar's neck. Caesar caught Casca's arm and stabbed back with his stylus, but the other conspirators closed in. Brutus, Cassius, Decimus, and dozens of others drove their daggers into the dictator. Ancient accounts say Caesar stopped resisting after he saw Brutus among his attackers. The conspirators expected gratitude. They got chaos. The Senate fled. Rome descended into panic. Mark Antony's funeral oration turned the mob against the assassins, and a thirteen-year cycle of civil wars followed that killed hundreds of thousands and destroyed the Republic the conspirators had claimed to defend. Caesar's adopted heir Octavian eventually emerged as Augustus, Rome's first emperor. The men who killed Caesar to prevent one-man rule guaranteed it.

The conspirators cornered Julius Caesar in the portico of Pompey's Theatre on March 15, 44 BC, with Tillius Cimber presenting a petition as the signal to attack. When Cimber grabbed Caesar's toga and pulled it from his shoulder, Casca lunged with his dagger, slicing the dictator's neck. Caesar seized Casca's arm and cried out in Latin, "Casca, you villain, what are you doing?" Casca shouted for help in Greek, and the remaining conspirators surged forward. The scene descended into a frenzy of stabbing. Approximately sixty senators participated. Caesar attempted to flee, blinded by blood streaming from his wounds, but tripped on the steps of the portico. The assassins continued stabbing him as he lay on the ground. According to Suetonius, a physician who later examined the body determined that Caesar received twenty-three stab wounds, but only the second wound to his chest was fatal. Most of his injuries were inflicted after he had already fallen. The assassination had been months in planning. Cassius Longinus organized the core group of conspirators, driven by personal grievance, ideological conviction, or both. Marcus Brutus provided the moral authority the conspiracy needed, his family name linked to the legendary Lucius Junius Brutus who had expelled Rome's last king five centuries earlier. Decimus Junius Brutus, one of Caesar's most trusted generals, was tasked with ensuring Caesar attended the Senate that day, overcoming the dictator's last-minute hesitation. The conspirators had debated killing Mark Antony alongside Caesar but decided against it, a decision that proved fatal to their cause. Antony survived, seized Caesar's papers and treasury, delivered a devastating funeral oration that turned public sentiment against the assassins, and formed a military alliance with Octavian that eventually destroyed the Republican cause at the Battle of Philippi in 42 BC. The assassination of the most powerful man in the Roman world did not save the Republic. It buried it.

Dr. Bernard Fantus established the world's first hospital blood bank at Cook County Hospital in Chicago on March 15, 1937, creating a system that transformed blood from a perishable emergency resource into a storable medical commodity. Fantus coined the term "blood bank" itself, drawing an analogy to a financial institution where deposits could be made in advance and withdrawals made when needed. Before Fantus's innovation, blood transfusion required a direct donor-to-patient transfer performed simultaneously in the operating room. Finding a compatible donor on short notice was often impossible, and patients frequently died from hemorrhage or surgical shock while doctors scrambled to locate a match. The discovery that sodium citrate could prevent blood from clotting and that refrigeration could preserve it for several days had been established during World War I, but no hospital had created a systematic storage and distribution system. Fantus, a Hungarian-born physician who had joined Cook County Hospital's staff in 1912, designed a system where donors could give blood in advance, which would be typed, tested, refrigerated, and cataloged for later use. Donors received credit for their contributions, which they or their family members could draw upon if they later needed transfusions. The system addressed both the supply problem and the timing problem that made emergency transfusions so unreliable. Cook County Hospital's blood bank proved so successful that hospitals across the country began establishing their own within months. The American Association of Blood Banks was founded in 1947 to standardize practices. The Red Cross launched its national blood collection program during World War II, building directly on the organizational model Fantus had created. Modern blood banking saves an estimated 4.5 million American lives per year. The entire global infrastructure of blood collection, storage, testing, and distribution traces its origin to a single refrigerator in a Chicago public hospital.

Eight days after state troopers beat nonviolent marchers on the Edmund Pettus Bridge in Selma, Alabama, President Lyndon Johnson stood before a joint session of Congress on March 15, 1965, and delivered the most powerful civil rights speech ever given by an American president. He concluded by adopting the anthem of the movement itself: "And we shall overcome." The Selma crisis had forced Johnson's hand. On March 7, 1965, known as Bloody Sunday, Alabama state troopers and county deputies attacked 600 civil rights marchers with tear gas, clubs, and mounted horsemen as they attempted to cross the Edmund Pettus Bridge on a planned march from Selma to Montgomery. Television cameras broadcast the violence into living rooms across America, generating a wave of public outrage that made congressional action unavoidable. Johnson seized the moment. Speaking to Congress and a television audience estimated at 70 million, he framed voting rights not as a partisan issue but as a moral imperative. "There is no Negro problem. There is no Southern problem. There is no Northern problem. There is only an American problem," he declared. He described his experience as a young teacher in a Mexican-American school in Cotulla, Texas, connecting the struggle for Black voting rights to the broader American promise of equality. Martin Luther King Jr. watched the address from the home of a supporter in Selma. Those who were with him reported that King wept. The speech was the only time a sitting president had explicitly aligned himself with the civil rights movement's own language, and King recognized the magnitude of the moment. Congress passed the Voting Rights Act on August 6, 1965. The law banned literacy tests, authorized federal oversight of voter registration in states with histories of discrimination, and included provisions that increased Black voter registration in the South from 23 percent to 61 percent within four years. Johnson's speech transformed a political calculation into a moral commitment that reshaped American democracy.

Christopher Columbus sailed into the port of Palos de la Frontera, Spain, on March 15, 1493, ending a seven-month voyage that had taken him to the Bahamas, Cuba, and Hispaniola, though he went to his grave believing he had reached the outer islands of Asia. He carried parrots, gold samples, several kidnapped Taino people, and a letter to King Ferdinand and Queen Isabella describing territories ripe for colonization. Columbus had departed Palos on August 3, 1492, with three ships and roughly 90 men, funded by the Spanish crown after years of lobbying courts across Europe. He made landfall on October 12, 1492, in the Bahamas, likely on the island the Taino called Guanahani. He spent the following months exploring Cuba and Hispaniola, establishing a small settlement called La Navidad on the northern coast of present-day Haiti after the Santa Maria ran aground on a reef on Christmas Day. The return voyage nearly killed him. Columbus departed Hispaniola in January 1493 aboard the Nina, accompanied by the Pinta. A violent storm in the mid-Atlantic separated the two ships and nearly sank the Nina. Columbus stopped in the Azores, where Portuguese authorities briefly detained his crew, and then in Lisbon, where he met with King John II of Portugal before continuing to Palos. Ferdinand and Isabella received Columbus at court in Barcelona with extraordinary ceremony. He presented the gold, the Taino captives, and his account of the territories he had claimed for Spain. The monarchs immediately began planning a second, much larger expedition. The papal bull Inter caetera, issued in May 1493, divided the newly discovered lands between Spain and Portugal. Columbus would make three more voyages to the Caribbean, but never found the Asian mainland he was seeking. His voyages initiated sustained European contact with the Americas, triggering the Columbian Exchange that transferred crops, diseases, animals, and human populations between hemispheres. The encounter he initiated killed an estimated 90 percent of the indigenous population of the Americas within a century.

Symbolics Inc., a Massachusetts computer company that manufactured specialized Lisp machines, registered symbolics.com on March 15, 1985, making it the first commercial domain name on the internet. The company paid nothing for the registration. The concept of a domain name as valuable digital real estate did not yet exist, and fewer than a handful of people outside government and academia even understood what the internet was. The Domain Name System had been created only the year before, in 1984, when computer scientists Paul Mockapetris and Jon Postel designed a hierarchical naming system to replace the increasingly unwieldy host table that had been used to map computer addresses on ARPANET. Before DNS, every computer on the network needed a manually maintained text file listing every other computer's address. As the network grew, this approach became unsustainable. Symbolics registered its domain through the Stanford Research Institute, which administered domain registrations as a government-funded service. The process was bureaucratic, not commercial. No one anticipated that domain names would become trademarked assets worth millions. Only five other .com domains were registered in 1985: bbn.com, think.com, mcc.com, dec.com, and northrop.com, all belonging to technology or defense contractors. Symbolics itself did not survive the decade. The Lisp machine market collapsed as general-purpose workstations from Sun Microsystems and others proved more economical. The company went bankrupt in 1993. Its historic domain name changed hands multiple times before being purchased by a domain investment company in 2009. By 2024, over 350 million domain names had been registered worldwide, and premium domains regularly sold for millions of dollars. The .com extension became the most valuable three letters in digital commerce. The first domain name registered on the internet belongs to a company that no longer exists, a fitting reminder that the infrastructure outlasts its builders.

German King Henry I defeated a Hungarian raiding army at the Battle of Riade in March 933, ending decades of devastating Magyar incursions that had terrorized central Europe and establishing the German kingdom as the dominant military power between the Rhine and the Elbe. The victory came at the end of a calculated ten-year truce during which Henry had systematically rebuilt Germany's defenses. The Magyars had been raiding deep into European territory since the late ninth century, exploiting the fragmentation of the Carolingian Empire. Their light cavalry tactics, based on rapid mounted archery and strategic withdrawal, made them nearly impossible to defeat using the heavy infantry formations that Frankish armies relied upon. They raided as far west as the Pyrenees and as far south as Italy, extracting tribute from kingdoms too weak to resist. Henry, who became King of East Francia (Germany) in 919, recognized that defeating the Magyars required time and preparation. After a Magyar force defeated his army and captured one of his nobles in 924, Henry negotiated a nine-year truce, agreeing to pay annual tribute in exchange for peace. He used the breathing space to construct a network of fortified towns across Saxony and Thuringia, building walls and towers that could shelter the rural population during raids and serve as bases for counterattack. Henry also reformed his military forces, training heavy cavalry that could match the Magyars in mounted combat rather than relying solely on infantry. When the truce expired in 933, Henry refused to resume tribute payments, reportedly sending the Magyars a mangy dog instead of the customary gold. The Magyars launched a punitive raid into Thuringia, where Henry's reorganized army met them near the Unstrut River. The details of the battle are sparse in surviving sources, but the outcome was decisive. The Magyar force was routed, and the raids into Saxony and Thuringia ceased. Henry's son Otto I would deliver the final blow at the Battle of Lechfeld in 955, ending the Magyar threat permanently. Henry I proved that the cost of preparation was always cheaper than the cost of defeat.