The Trebatius Testa reference article from the English Wikipedia on 24-Apr-2004
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Trebatius Testa

Gaius Trebatius Testa (fl. 1st century BC) was a jurist of ancient Rome.

He was a protege of Cicero; Cicero dedicated his Topica to Trebatius, and recommended Trebatius as a legal advisor to Julius Caesar. Trebatius enjoyed Caesar's favor, and later that of Augustus as well.

Trebatius' writings included a de religionibus and de iure civili, but not even excerpts of these survive. He was, however, frequently cited by later jurists, and also had a high reputation as the teacher of Marcus Antistius Labeo.