Kahn introduced himself as Masamune Byakuya to the Hero of Space's party and as soon as he did… the entire congregation whether it was the party members, the soldiers, or the servants within the pagoda; turned dead silent.
Because the last name 'Masamune' had a very distinct history in the Erdve Empire.
According to everyone's knowledge, when the First Emperor, Miyamoto Musashi created the Erdve Empire after throwing out the previous regime… He had 5 Loyal Daiymos who fought alongside him during the revolt against the previous Emperor's forces.
The main reason for the revolt was that the old regime sacrificed plenty of citizens annually to monsters and supposed guardians who were nothing more than variants of Godbeasts. All so that their hunger could be appeased with the lives of thousands of innocent citizens and the nobles or royals wouldn't have to fight those monsters and lose the lives of their saint warriors.