Sir John Vanbrugh (1664–1726) was an English architect and playwright, best known for his role in the development of English Baroque architecture. He designed notable buildings such as Castle Howard and Blenheim Palace, showcasing grand styles and intricate details that reflect the era's artistic trends. In addition to his architectural work, Vanbrugh was also a successful playwright, with his most famous play being The Relapse. His contributions to both architecture and theatre have left a lasting impact on British culture, making him a significant figure in the history of the arts in England.