In 1067, Vseslav rebelled in an attempt to overthrow Izyaslav and become Grand Prince himself, claiming the right as a great-grandson of Vladimir the Great through Izyaslav Vladimirovich. Vseslav's attempt was unsuccessful, and ended in his imprisonment. Troubles for Izyaslav were to continue though. In 1068, Izyaslav's alleged negligence to the advances and incursions of the Cuman people (Polovtsy) after the defeat at the Battle of the Alta River led the citizens of Kiev to revolt; Vseslav was released, and took the Kievan throne while Izyaslav fled to Boleslaw in Poland. With Polish assistance Izyaslav returned in May 1069, expelled Vseslav and retook the throne. This victory for Izyaslav secured the Kievan throne for the descendants of Yaroslav Vladimirovich, and thereafter the descendants of Izyaslav Vladimirovich confined themselves to Polotsk where they reigned with semi-independent status.