The monastery was founded by John I in 1390. The church consists of three large naves covered with star-shaped cross ribs, all of which have been worked in stone. Work on the current church was initiated in 1499; its architect was Juan de Arandia and it was designed by Rodrigo Gil de Hontañón, being built between 1569 and 1572. The monastery was not begun until the last 16th century. The church is separated by a plateresque screen. It has a long monasterial façade which follows the canons of El Escorial; most of its works of art are now in the National Sculpture Museum.