Ōnin War
The Ōnin War, which broke out in 1467, marked the beginning of 147 years of widespread warfare (called the Sengoku period) between "daimyōs" (feudal lords) across the entire archipelago. For the duration of the Ōnin War (1467–1477), and into the Sengoku period, the entire city of Kyoto became a battlefield, and suffered extensive damage. Noble family mansions across the city became increasingly fortified over this ten-year period, and attempts were made to isolate the city as a whole from the marauding armies of samurai that dominated the landscape for over a century.