The Sabha was an assembly of elders or important persons, often associated with the king's court. It served as a council that advised the king and also functioned as a court of justice. While it wasn't a "National Assembly of all citizens" (that was more characteristic of the Samiti) nor strictly limited to "profession men," it was closely linked to the royal authority and its functions, making "Royal court" the most appropriate description among the given options, representing a key assembly within the political structure centered around the ruler.