The Visigothic period (409-711) left Guadamur the most interesting chapter in its history. In August 1858, heavy storms over Guadamur uncovered a series of tombs at the site of the gardens of Guarrazar. Neighbours Francisco Morales and María Pérez discovered the Treasure of Guarrazar by chance; it is the most important of those found in the Peninsula on the Visigoth era. These findings, other of some neighbors and the archaeological excavation of the Ministry of Public Works and the Royal Academy of History (April 1859), they formed a group consisting of: six crowns, five crosses, a pendant and remnants of foil and channels (almost all of gold, now at the National Archaeological Museum of Madrid), a crown and a gold cross and a stone engraved with the Annunciation (now in the Royal Palace of Madrid), three crowns, two crosses, links and gold pendants (now at the Musee de Cluny, Paris), a crown, and other fragments of a tiller with a crystal ball (stolen from the Royal Palace of Madrid in 1921 and still whereabouts unknown). The most valuable of all is the crown of king Recesvinto (which today names the main square of the town): blue sapphire parts come from the former Ceylon, now Sri Lanka. There were also many fragments of sculptures and the remains of a building, perhaps a Roman "delubrum" (sanctuary or place of purification); in the following centuries it was dedicated to Christian worship as a church or oratory, which housed a number of graves: in the most important was found a skeleton lying on a bed of lime and sand, and preserved the stone slate, whose Latin inscription mentions a priest named Crispín, dating from 693 (51st year of the reign of Égica, year of the 16th Council of Toledo. This plaque is now in the National Archeological Museum in Madrid. According to some hypothesis, Guarrazar was a monastery that served as a hideout for the real treasure of the court, Toledo churches and monasteries to prevent their capture by the Muslims: the monastery of Sancta Maria in Sorbaces, according to the inscription of the Sónnica cross, a piece of the treasure of Guarrazar preserved in Paris.