A lyric requesting protection from the “murderous rage” of Turks and these people is often removed from modern versions of the hymn “Erhalt uns, Herr, bei deinem Wort.” To open a work titled for one of these people, each voice leaps up a perfect fourth and descends in a stepwise fashion. A work titled for one of these people splits the text of the Agnus Dei into two movements. A genre named for one of these people was modified by adding an improvised vox organalis to the vox principalis to create works called organum. Legendarily, a ban on polyphony was averted by the composition of a mass titled for a man with this position, Marcellus (10[1])II, by Giovanni Palestrina. For 10 points, name this position held by the namesake of a form of monophonic chant, (10[1])Gregory I. (10[1])■END■ (10[1])