By banishing nobles and taking over the country. Thats how one does it. Why else would Chenier belittle my own stature in the Tomb islands? I was born there he merely joined as a Shadovaran and then as a D'Haran. I was there since Melodia. He may have served their longer but it was his supported government that banished lowly knights back during the reign of terror.
Thats taking over a realm, maybe was converting the realm to a different culture by banning the nobles, idk since I wasn't there but that has nothing to do with destroying history.