At The Court Of His Catholic Majesty is a historical fiction novel written by William Miller Collier and published in 1912. The story takes place in the 17th century and follows the adventures of an Englishman named John Langdon who travels to Spain and becomes embroiled in the political and social intrigues of the Spanish court. Langdon is a loyal servant of King Charles II of England and is sent to Spain on a secret mission to negotiate a marriage...