The Complutense University of Madrid (Universidad Complutense de Madrid) is a public research university located in Madrid. Founded in Alcalá in 1293 (before relocating to Madrid in 1836), it is one of the oldest operating universities in the world. It is located on a sprawling campus that occupies the entirety of the Ciudad Universitaria district of Madrid, with annexes in the district of Somosaguas in the neighboring city of Pozuelo de Alarcón. It is named after the ancient Roman settlement of Complutum, now an archeological site in Alcalá de Henares, just east of Madrid.