Eberron 5E: Background -- Dragonmarked Scion
You were born to one of the thirteen dragonmarked houses that wield enormous power throughout Khorvaire. Perhaps you have manifested one of the magical dragonmarks that showed your descent from a house member, or were born to someone who was granted member-ship or married into a house; regardless, you have lived a life of privilege and responsibility. The dragonmarked houses are deeply entrenched in the economic and social ecology of Khorvaire. All guild monopolies are controlled by the houses, which fix prices and maintain quality standards. Although the houses are forbidden from holding lands or political office by the Korth Edicts, many dragonmarked heirs have great influence in politics due to their affiliations and personal power.