Tribonianus, the main architect of *Justinian's codification of Roman law in the 6th cent. ce, was a lawyer from *Side in Pamphylia who practised as an advocate and rose to be *magister officiorum (master of offices) and in September 529 quaestor (minister of justice). He was a member of the commission to prepare Justinian'sCodex of imperial laws (ce 528–9), and in 530 Justinian put him in charge of the preparation of the Digesta of legal writings (530–3), which he supervised throughout. He seems also to have played a full part (though this is disputed) in the detailed work of excerpting and editing the texts of earlier lawyers, of which he had a large personal collection and a deep knowledge. In 533 he headed a commission of three to prepare an up-to-date version of *Gaius(2)'s Institutes, and in 534 produced a second edition of the Codex.