The guards at the gate stopped him. He wasn't a Royal messenger of any kind, but they were trained to recognize colors and people, so they knew he was Trabian.
Ahhhh...Where was Gregory? Gregory?? The guard on duty that was multi-lingual. They always had one. Trabian? "Welcome to Hollow Bastion, Sir. From Trabia? Just letters? Anything urgent?" Anything that needed to go to the royal family, or General Rotharr? They could get that out of the way first. He asked for his name so they could enter him in the castle register, and called for a servant to come get his stuff and his horse. Someone to let the King know, if he wasn't busy, since it didn't seem urgent.