 In 1332 the castle of the counts in Gravellona, however, belong to Cavallazzi family, which, together with Barbavara and Tornielli, are the oldest feudal lords of Gravellona.In 1581, the population gravellonese stood about 1000 inhabitants.In 1532 Gravellona (who had since returned to the County of Novara) was joined to the new province of the County of Vigevano or Vigevanasco .