Wikipedia
Pedrolino is a primo zanni, or comic servant, of the Commedia dell'Arte; the name is a hypocorism of Pedro (Peter), via the suffix -lino. The character made its first appearance in the last quarter of the 16th century, apparently as the invention of the actor with whom the role was to be long identified, Giovanni Pellesini. Contemporary illustrations suggest that his white blouse and trousers constituted "a variant of the typical zanni suit", and his Bergamasque dialect marked him as a member of the "low" rustic class. But if his costume and social station were without distinction, his dramatic role was certainly not: as a multifaceted "first" zanni, his character was—and still is—rich in comic incongruities.
Many Commedia historians make a connection between the Italian Pedrolino and the later Pierrot of the French Comédie-Italienne, and, although a link between the two is possible, it remains unproven and seems unlikely, based on the scant evidence of early Italian scenario texts.