The Synaxis of Novgorod Hierarchs is also celebrated on October 4 and on the third Sunday after Pentecost. On October 4, 1439 St John (September 7) appeared to the presiding hierarch St Euthymius (March 11) and ordered him to serve a special panikhida in memory of those buried at the Sophia cathedral (the Russian princes and Archbishops of Novgorod, and all Orthodox Christians) on the Feast of the Hieromartyr Hierotheus, first Bishop of Athens.
Then the incorrupt relics of St John were uncovered. Afterwards, the Synaxis was established to mark the glorification of the Novgorod hierarchs. E. E. Golubinsky says that because these hierarchs remained unknown at the time of their glorification, he determined this date for their common celebration was established in the period between the time of the Moscow Council of 1549 and the time of the formation of the Holy Synod (E. E. Golubinsky, History of the Canonization of Saints in the Russian Church. Moscow, 1903, p. 157).
Saint John the Wonderworker, Archbishop of Novgorod, is also commemorated on September 7.