On March 15, 44B.C. Julius Caesar, the "dictator for life" of the Roman Empire, was murdered by his own senators at a meeting in a hall next to Pompey's Theatre. The conspiracy against Caesar encompassed as many as sixty noblemen, including Caesar's own protege, Marcus Brutus.
Caesar was scheduled to leave Rome to fight in a war on March 18 and had appointed loyal members of his army to rule the Empire in his absence. The Republican senators, already chafing at having to abide by Caesar's decrees, were particularly angry about the prospect of taking orders from Caesar's underlings. Cassius Longinus started the plot against the dictator, quickly getting his brother-in-law Marcus Brutus to join.
The Seven Years' War, a global conflict known in America as the French and Indian War, ends with the signing of the Treaty of Paris by France, Great Britain, and Spain.
In the early 1750s, France's expansion into the Ohio River valley repeatedly brought the country into armed conflict with the British colonies. In 1756, the British formally declared war against France.
In the first year of the war, the British suffered a series of defeats at the hands of the French and their broad network of Native American alliances. However, in 1757, British Prime Minister William Pitt (the older) recognized the potential of imperial expansion that would come out of victory against the French and borrowed heavily to fund an expanded war effort. Pitt financed Prussia's struggle against France and her allies in Europe and reimbursed the colonies for the raising of armies in North America. By 1760, the French had been expelled from Canada, and by 1763 all of France's allies in Europe had either made a separate peace with Prussia or had been defeated. In addition, Spanish attempts to aid France in the Americas had failed, and France also suffered defeats against British forces in India.
The Seven Years' War ended with the signing of the treaties of Hubertusburg and Paris in February 1763. In the Treaty of Paris, France lost all claims to Canada and gave Louisiana to Spain, while Britain received Spanish Florida, Upper Canada, and various French holdings overseas. The treaty ensured the colonial and maritime supremacy of Britain and strengthened the 13 American colonies by removing their European rivals to the north and the south. Fifteen years later, French bitterness over the loss of most of their colonial empire contributed to their intervention in the American Revolution on the side of the Patriots.
On March 13, 1781, the German-born English astronomer William Hershel discovers Uranus, the seventh planet from the sun. Herschel's discovery of a new planet was the first to be made in modern times, and also the first to be made by use of a telescope, which allowed Herschel to distinguish Uranus as a planet, not a star, as previous astronomers believed.