It was named after a Bulgarian colony, which settled west of Como, to the right of the Lura stream. Grasa comes from the Teutonic meadow, typical of this area. In the past, and partly still today, meadows and breeding were really flourishing. It joined forces with Como in the war against Milan; in the Middle Ages it was never independent, but depended on the country of Seprio, on Appiano Gentile and, under the Spaniards, on the Del Rio. In the Napoleonic period, Bulgarograsso and Appiano were given to the Castiglioni. Where today the church Cascina di St. Anna stands, rose probably a fortress, called St. Maria. This was therefore a strategic point. Moreover, Austrian armed forces and the army of the Reign of Italy drilled in Bulgarograsso.