At that very time also Hippolytus, who besides very many other treatises composed also the work On the Pascha, in which, setting forth a register of dates and putting forward a certain canon of a sixteen-year cycle concerning the Pascha, he limits his reckoning of the times down to the first year of the emperor Alexander. Of his other treatises, those that have reached us are these: On the Hexaemeron, On what followed the Hexaemeron, Against Marcion, On the Song, On Parts of Ezekiel, On the Pascha, Against All the Heresies; and very many others also might be found preserved among many people.