""A Letter to Earl Grey, on the Obligation of the Coronation Oath"" is a political treatise written by Arthur Philip Perceval in 1833. The book is addressed to Charles Grey, 2nd Earl Grey, who was the British Prime Minister at the time. In the book, Perceval argues that the coronation oath taken by the monarch is a sacred and binding commitment to uphold the laws and traditions of the country. He argues that any attempt to violate this oath, particularly...