The Soest Feud (German: Soester Fehde), or Feud of Soest, was a feud that took place from 1444 to 1449 in which the town of Soest claimed its freedom from Archbishop Dietrich of Cologne (1414–1463), who tried to restore his rule. The town of Soest opposed this attempt on 5 June 1444 by accepting a new suzerain, John I, the Duke of Cleves-Mark, who guaranteed the town its old rights as well as new ones. As a result Emperor Frederick III imposed the imperial ban on the town. The victory of the town (as a result of the Archbishop of Cologne abandoning his attempt) meant that Soest had de facto more freedom than a free imperial city until it was annexed by Prussia, but at the same time it had to forfeit its economic power because it was now an enclave within Cologne's territory.