Its name means "castle on the river Henares", therefore a castle on waves of water appears on its shield. Its creation dates back to the Celtiberian (Ikesankom Kombouto or Iplacea) but it will be with the arrival of the Romans when it will become a remarkable city called Complutum. In the Middle Ages, three cultures came to live simultaneously in the city: Jews, Muslims and Christians.
Thanks to the importance of its historic site, this city is one of the nine cities in Spain that Unesco has classified as unique, declaring it a World Heritage City in 1998.
It is famous for its university, built by Cardinal Cisneros on April 13, 1499, and for being the birth-place of Cervantes.
The motto or slogan "City of knowledge" is being reported as identifying the city.