Robert Smythson was an English architect and designer, known for his significant contributions to the Elizabethan architectural style during the late 16th century. He is best recognized for his work on notable buildings such as Hardwick Hall in Derbyshire, which showcases his innovative use of large windows and intricate designs. Smythson also authored a treatise on architecture titled The First and Chief Groundes of Architecture, which outlined his principles and ideas. His influence extended beyond individual projects, as he played a key role in shaping the architectural landscape of England during the Renaissance period.