The professors are ordinary and extraordinary, and free professors (liberi docenti), corresponding to the German Privatdozenten, are also allowed to be attached to the universities.
At first all counts were reckoned as princes of the Empire (Reichsfiirsten); but since the end of the 12th century this rank was restricted to those who were immediate tenants of the crown,' the other counts of the Empire (Reichsgrafen) being placed among the free lords (harones, liberi domini).
109) speaks of them as liberi, which points to their enjoying a certain amount of independence under Roman government.
Like the Cubi, they also are called liberi by Pliny.
de gratiae liberi arbitrii concordia, which was probably written by a follower of Augustine.
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