These bishops may be known as hierarchs in the Eastern Catholic Churches. Philaret was also directly involved in the imprisonment of Old Believer hierarchs and monastics. He is one of the best-known contemporary Eastern Orthodox hierarchs and theologians. Earlier, Archbishop Germanos of Chernivtsi concelebrated with Greek and Constantinopolitan hierarchs in Thessaloniki. The Church of the Three Hierarchs Greek Orthodox serves the Greek residents of the community. High Prophets, or Hierarchs, are the supreme leaders of the theocratic Covenant. "Tri Sviatitelia" was named after the Three Holy Hierarchs of the Orthodox Church. On 1 September, in Istanbul, a Synaxis of Hierarchs of the Ecumenical Throne began. Preliminary designs for the Prophets, including the Hierarchs, were done by artist Shi Kai Wang. Disputes raged in 11th century Constantinople about which of the three hierarchs was the greatest. Still, the early postwar years were unsettling to church hierarchs. It was named for the Three Holy Hierarchs. Garion thereafter incapacitates the Hierarchs of Rak Cthol in retaliation for an attack upon Durnik. These were the first concelebrations between hierarchs of the OCA and ROCOR. He is assisted by a council of hierarchs according to the norms of law (CCEO.