Trecanum

Trecanum an anthem sung after the communion, before the 6th century, in honor of the Holy Trinity; called by this name in Gaul. Some think it was the Apostles Creed. In the Greek Church there is a confession of the Holy Trinity sung after the Ilagia Hagiois. The latter form is mentioned by Cyril of Jerusalem, Basil, and the Mozarabic and Gallican liturgies.