- Etymology: The Latin forms (Castrum Sarracenum) or Occitan (Castrosarraceno) of Castelsarrasin have prompted etymological many assumptions. Of fancier (castle built by the Saracens) to the most credible (Saracen castle towers) retain the explanation provided by Dauzat-Rostaing: Castelsarraceno comes from "Castel Cerratius of" man's name.
- History:
- Located at the tip of Languedoc, Castelsarrasin with its castle and fortifications become the Middle Ages, one of the main strongholds of the County of Toulouse. The successive wars and epidemics do not undermine its reputation as the Cathedral Chapter of the Diocese Lower Montauban, and in 1568 the Parliament of Toulouse in 1595 Castelsarrasin choose, remained faithful to Catholicism, as a refuge.
- In 1808, Castelsarrasin is chosen as the sub-prefecture of the department recently created: Tarn-et-Garonne.
- The development of communication channels (channel, railroad), the establishment of a metallurgical plant, a barracks, two colleges and the various urban developments contribute to the vitality and dynamism of the city throughout 19th century. In the 20th century despite the terrible bloodletting of the two wars, the city continues to grow until today where it is clearly only the second site's Economic Department.
- Origin:
- Castelsarrasin is mentioned for the first time in 1156.
- Yet the existence of the Church of St. Saviour, named in the will of the Count of Toulouse in 961, marks the presence of an agglomeration, since the 10th century, around the building.
