Known as "Pitt the Younger" to distinguish him from his father, Pitt the Elder. Pitt was a British Prime Minister from 1783 to 1801, again resuming office from 1804 to 1806. Pitt orchestrated the Acts of Union 1800 which united Great Britain and the Kingdom of Ireland into the United Kingdom. His tenure was characterized by the occurrences of the French Revolution and Napoleonic wars. Pitt was a major catalyst in strengthening the office of prime minister, generally regarded as an efficient and reform-oriented politician.