George William Frederick, the eldest son of Frederick, Prince of Wales, and Princess Augusta of Saxe-Gotha, was born in London. His birth marked the beginning of a life that would significantly influence British history.

Following the death of his grandfather, King George II, George III ascended to the throne at the age of 22. His reign began during the Seven Years' War, setting the stage for his military and political challenges.

The Treaty of Paris ended the Seven Years' War, with Britain emerging victorious. This victory solidified British dominance in North America and India, though it sowed seeds of discontent among the American colonies.

The American colonies rebelled against British rule, leading to the Declaration of Independence in 1776. The Treaty of Paris in 1783 recognized American independence, marking a significant loss for the British Empire.

The Acts of Union united Great Britain and Ireland into the United Kingdom of Great Britain and Ireland, with George III as its first monarch. This union took effect on January 1, 1801.

George III experienced periods of mental illness, diagnosed as porphyria. By 1811, his condition worsened, leading to the Regency Act, where his son, the future George IV, took over as regent.

King George III died at Windsor Castle, ending a reign of nearly 60 years. His legacy includes a reformed empire, advancements in science and agriculture, and the foundation of the United Kingdom.