It might have been expected that Gregory's name would appear among those who took part in the First Council of Antioch against Paul of Samosata; probably he took part also in the second council held there against the same heresiarch, for the letter of that council is signed by a bishop named Theodore, which had been originally Gregory's name.
Ada harapan bahwa nama Gregorius akan muncul di antara mereka yang mengambil bagian dalam Konsili Pertama Antiokhia melawan Paulus dari Samosata; mungkin dia mengambil bagian juga dalam konsili kedua yang diadakan di sana melawan heresiarkh (tokoh sesat) yang sama, karena surat konsili itu ditandatangani oleh seorang uskup bernama Theodore, yang merupakan nama asli Gregorius.