Lewis Short
assertor | ads- (noun M) : (), , id.
* One who formally asserts that another is free or a slave.
* A restorer of liberty.
* Lit.: adsertores dicuntur vindices alienae libertatis, Don. ad Ter. Ad. 2, 1, 40; cf. 2. assero, I. A.: populo detrectante dominationem atque adsertores flagitante,Suet. Caes. 80: Catoni gladium adsertorem libertatis extorque,Sen. Ep. 13.
* He who claims or declares one to be a slave (cf. 2. assero, I. B.): cum instaret adsertor puellae,Liv. 3, 46, and besides only id. 3, 47.
Charlton T. Lewis, Charles Short, A Latin Dictionary