Gaius (gāˈəs, gĪˈ–) [key], fl. 2d cent., Roman jurist. He is known for the Institutes (repr., 2 vol., 1967; Vol. I is a translation of the text, Vol. II consists of commentaries), a legal textbook that contributed materially to modern knowledge of early Roman law. It was much used in the compilation of the Corpus Juris Civilis.
See study by A. M. Honore (1962).