John III Vatatzes was greatly interested in the collection and copying of manuscripts, and William of Rubruck reports that he owned a copy of the missing books from Ovid's Fasti (poem). Ruburck was critical of the Hellenic traditions he encountered in the Empire of Nicaea, specifically the feast day for Felicitas favored by John Vatatzes, which Risch suggests would have been the Felicitanalia, practiced by Sulla to venerate Felicitas in the 1st Century with an emphasis on inverting social norms, extolling truth and beauty, reciting profane and satirical verse and wearing ornamented "cenatoria", or dinner robes during the day.