Andrea Palladio was an influential Italian architect from the 16th century known for developing Palladian architecture. He apprenticed as a stonecutter and learned principles from Vitruvius and Alberti. His most famous works include the Villa Rotunda, Villa Barbaro, and Villa Cornaro. He designed buildings with dramatic exteriors, economic materials, and interior harmony. Palladio's work had lasting influence through his book The Four Books of Architecture and his integration of beauty and meaning suited to his clients' social status.