After exercising a rule of terror in Bucharest, capturing and executing several boyars, they were decisively defeated by Rákóczi on June 26, 1655, in a battle on the Teleajen River.
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Menaced by the growing privileges of boyars and threatened to lose land grants or be turned into serfs, the Wallachian seimeni rebelled in 1655, being crushed after Prince Constantin Şerban enlisted the help of George II Rákóczi, Prince of Transylvania, as well as that of Moldavia's Voivode Gheorghe Ştefan.