Bible Encyclopedias
Trecanum

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

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.

Bibliography Information
McClintock, John. Strong, James. Entry for 'Trecanum'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/​encyclopedias/​eng/​tce/​t/trecanum.html. Harper & Brothers. New York. 1870.