Acctually, I believe he was know as they as for him specifically.
I take the forehead Trills to be a "race" of the Trill humaniod speice. My take on them-- They werey the first to meet the Symbionts and to be their host. They used this to their advantage to become the ruling class on the Trill home world. They also claimed only those of thier group were able to host symbonts both to keep power and to keep the spotted Trills from fighting with them over the symbonts. Smart spotted Trills figure out that they too could host symbonts. Of course, they were smart enough to figure out that as was revelved in DS9 that 50% of Trills could become symbonts and created the deseption that while spotted Trills could become joined that only a few could.