The name Lourinhã possibly originated in the period of Roman domination, when a villa was located in the area. The origin of the medieval village is linked to "Jordan", a French knight who took part in the successful Siege of Lisbon in 1147. King Afonso Henriques granted Jordan the region of Lourinhã as fief and allowed him to grant a foral (letter of feudal rights) to its settlers in 1160. The name Lourinhã may be related to the origin of its feudal lord, since Jordan was from the Loire region in France.