According to the General Cattle Census on the Continent of the Kingdom of Portugal (1870), “… bísaro is the name given to the tucked-up pig, more or less leggy, with loose ears to distinguish him from the good plump and pernicious pig of the Alentejo”. The name "Celtic" is proposed and used by Sanson to express the antiquity of the race of this type, which was the only one that existed in the regions inhabited by the Celtic people, such as the north of Portugal and Galicia, the former Gaul and the British islands, before the introduction in these countries, of the Asian and Romanesque races.