On this day, Constantine consecrated his namesake city on the site of ancient Byzantium, declaring it the 'New Rome.' The ceremony, blending Christian and pagan rites, marked a decisive pivot of the empire's political center of gravity toward the Greek-speaking east. Constantinople would remain the seat of Roman and later Byzantine power until 1453.

At Fontenoy in the Austrian Netherlands, Maurice de Saxe, though gravely ill and carried on a litter, out-maneuvered the Duke of Cumberland's advancing column with concentrated artillery and infantry fire. King Louis XV watched the battle from nearby high ground. The victory boosted French morale and became legendary in French military memory, later invoked by Napoleon.

Minnesota's admission to the United States capped a rapid decade of white settlement following the 1851 Treaty of Traverse des Sioux, which had opened vast Dakota lands to farmers. The new state's population had exploded from a few thousand to over 150,000 in ten years. Its statehood set the stage for the brutal Dakota War of 1862, just four years later.

Dalí grew up to become surrealism's most flamboyant showman, fusing meticulous technical draftsmanship with hallucinatory imagery drawn from dreams, Freudian theory, and his own eccentric psyche. Works like 'The Persistence of Memory' made him one of the 20th century's most recognizable artists, while his waxed mustache and theatrical public persona made him a celebrity far beyond the art world.

Ten days after a covert Mossad team seized Eichmann off a Buenos Aires street, Ben-Gurion revealed the operation to the Knesset, stunning the world. Eichmann, architect of the Nazi deportation machinery that sent millions to death camps, had lived under a false identity in Argentina for years. His trial in Jerusalem the following year became a global reckoning with the Holocaust.

During a Bradford City match, a fire believed to have started from a discarded cigarette in accumulated rubbish beneath the aging wooden stand spread with terrifying speed, trapping fans against locked exit gates. The disaster, unfolding live on television, killed 56 people and injured more than 250. It prompted sweeping new fire safety legislation for sports grounds across Britain.

After Kasparov had won their 1996 encounter, IBM engineers rebuilt Deep Blue with vastly greater processing power, capable of evaluating 200 million positions per second. In the tense rematch's final game, Kasparov, rattled and suspecting human interference, resigned after just 19 moves. The result stunned the chess world and became a landmark moment in artificial intelligence history.