Michael Synkellos

Michael Synkellos (Greek: Μιχαήλ o σύγκελλος), also spelled Syncellus (c. 760 – 4 January 846), was a Greek Orthodox Arab Christian priest, monk and saint. He held the administrative office of synkellos of the patriarchate of Jerusalem (c. 811–815) and the patriarchate of Constantinople (843–846). He was involved in disputes over the filioque clause and over Byzantine iconoclasm, which landed him in prison for the period 815–843. He nevertheless wrote extensively, producing grammar, theology, hagiographies, hymns and poetry. He wrote in Greek and made at least one translation from Arabic.