 In Central Po Plain the earliest evidence of attempts to clear the forests and drain the wetlands is mentioned in historical documents from the late 8th century, but only from the 10th to 13th centuries were land and water management activities actually carried out widely.Further civil wars escalated in the Guelph-Ghibelline reciprocate bloodbath of the 13th and 14th centuries.The Signorie came from spent out Communal institutions.