《管子·度地》
就拥戴天子的情况来说，天子可以有上万个诸侯国，其中分公侯伯子男五等。
以奉天子，天子有万诸侯也，其中有公侯伯子男焉。
As to supporting the Emperor, the Emperor could have up to ten thousand such principalities, divided into five ranks of dukes, marquesses, earls, viscounts, and barons.