 On 21 December 2006, he was elected auxiliary bishop of the Metropolis of Korea and bishop of Zelon by the Holy Synod of the Ecumenical Patriarchate.Bishop Ambrosios was elected to the office of Metropolitan of Korea on 28 May 2008, and was enthroned 20 July 2008, at St Nicholas Cathedral in Seoul.He received an honorary citizenship of the Seoul in 2010.