Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Organizations (hierarchy name)
4. organizations (groups)
5. administrative bodies
6. political administrative bodies
7. [political administrative bodies by degree of independence]
8. dependencies

Anotations

Scope note:

States that are subordinate to the ruler of another state, usually providing military assistance or tribute to the dominant state. Examples are Troy, which was a vassal state of the Hittites, and historical Tibet, which was a vassal state of China.