William Pitt the Younger was a British politician who served as the Prime Minister of the United Kingdom from 1783 to 1801, and then again from 1804 until his death in 1806. He was known for his strong leadership and political skills, and he played a key role in shaping British foreign and domestic policy during a time of great change and upheaval, including the French Revolution and the Napoleonic Wars. Pitt was also a strong advocate for parliamentary reform and was instrumental in the abolition of the slave trade. He is remembered as one of the most influential and effective Prime Ministers in British history.