Charles Emmanuel I, Duke of Savoy
In 1612 he published anonymously the booklet "Le Filippiche" in which he attacked the Spanish domination of Italy. Though he always denied having written it (probably for fear of Spanish retaliation), the work became famous enough to ingratiate Tassoni to the Charles Emmanuel I, Duke of Savoy, who, in 1618 hired him in Turin with the title of "first secretary".