Samuel Pepys was an English naval administrator and Member of Parliament who is best known for his diary, which he kept from 1660 to 1669. His diary provides a vivid and detailed account of life in 17th century London, including events such as the Great Plague and the Great Fire of London. Pepys was also a significant figure in the Royal Navy, serving as Chief Secretary to the Admiralty and later as a Member of Parliament. His diary is considered an important historical document and provides valuable insights into the social, political, and cultural life of the time.