Piatesi is typically Emilian, from Bologna and Conselice in the Ravenna area, it should derive from the archaic term piateze or piatese referring to those who deal with sponsoring in relation to piati (court litigation, discussion), of which we have an example in a document of 1370 : "... Margarita, mogere de Amgelucio da Reguenda, dweller of Calvi, fato soe certain meso et piateze Fenogio da Lumio, habitator de Calvi, who is present, to delegate all that belonged to them ...", probably task carried out by the parent.
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