Early in 868, Anastasius was a patron of Sts. Cyril and Methodius who came to Rome with their Slavonic translation of the liturgy. Later that year, he was implicated in the criminal acts of a cousin and was again condemned. He was rehabilitated a year later and was sent to Constantinople to arrange a marriage between Ermengard, the daughter of Louis II, and the oldest son of Basil I. He also attended the council which condemned Patriarch St. Photios and translated its acta into Latin for the pope.
He translated the acta of the Council of Nicea and a transcript of the trial of St. Maximus the Confessor. Anastasius did many translations between 872-878 for Pope John VIII; their quality is uneven. Anastasius wrote commentaries on the writings of St. Dionysios the Areopagite and contributed to the Liber Pontificalis. He was involved in John VIII's resolution of the Photian schism, arguing that the Latin filioque clause did not refer to the eternal procession of the Holy Spirit, but only to His economic mission.
Karen Rae Keck