Great Moscow Synod
The Great Moscow Synod (Russian: Большой Московский собор, romanized: Bol'shoy Moskovskiy sobor) was a Pan-Orthodox synod convened by Tsar Alexis of Russia in Moscow in April 1666 in order to depose Patriarch Nikon of Moscow. The council condemned the famous Stoglav of 1551 as heretical, because it had dogmatized the Russian church's rituals and usage at the expense of those accepted in Greece and other Eastern Orthodox countries.