A Commemoration Without a Surviving Life
Many bishops of the early and medieval Church are remembered in the liturgical calendar by name and rank alone, their detailed biographies lost to time or never committed to a circulating written life. Saint Gregory the Bishop belongs to this category: the Church preserves his memory and the day of his commemoration, August 30, while the particulars of his ministry, the see he governed, and the manner of his repose are not recorded in the available synaxaria.
Where a fuller life cannot be reconstructed responsibly from the sources, the honest course is to record what is attested and to refrain from inventing detail. What is securely attested here is the fact of the commemoration itself.