San Isidoro de León is a historic church and former monastery located in León, Spain. It was built in the 11th century and is known for its Romanesque architecture, featuring intricate stone carvings and beautiful frescoes. The church is dedicated to Saint Isidore of Seville, a prominent scholar and archbishop. The site also houses the Royal Pantheon, where several kings and queens of the Kingdom of León are buried. It is recognized as a significant cultural heritage site and is part of the Route of Santiago de Compostela, attracting many visitors interested in history and architecture.