 Complete the following phrase:  In 1471 Marfa and her sons, Dmitrii and Fedor, as the last representatives of the anti-Muscovite Boretsky family, attempted to negotiate with Casimir IV Jagiellon the terms of the citys handover to the Grand Duchy of Lithuania, provided that the citys ancient privileges and rights will be retained. They also invited Mikhailo Olelkovich to become citys ruler. On hearing about Marfas manoeuvres, which violated the earlier Treaty of Yazhelbitsy, Ivan III advanced against Novgorod and defeated the Novgorodian volunteer army in the 