The Ruling Conclave of the Tholian Assembly was the collection of Tholians who jointly served as the head of state and head of government of the Tholian Assembly. (VAN novel: Harbinger, ST - Destiny novel: Mere Mortals)

Typically, this body was responsible for withholding alarming knowledge from the lower echelons of the Lattice in the interest of preventing any forms of reckless action from being conducted by individuals that sought to harm the rest of the Assembly. (VAN novel: Harbinger)

In the mirror universe, the Tholian Assembly was likewise led by the Ruling Conclave. (ST - Mirror Universe novel: Rise Like Lions)