Although educated primarily in the common law, the Founding Generation was keenly aware of the Roman Civil Law, and referred to it frequently during the Constitution’s framing and ratification.  The following website collects, in searchable word processing and PDF formats, the principal compilations of classical Roman law.

Institutes of Roman Law by Gaius

Institutes of Roman Law by Gaius PDF format, file size = 668 KB; Latin
Institutes of Roman Law by Gaius MS Word format, file size = 862 KB; Latin

Digest of Justinian

Digest of Justinian PDF format, file size = 1,345 KB; Latin
Digest of Justinian, MS Word format, file size = 12,257 KB; Latin

The Institutes of Justinian

The Institutes of Justinian, PDF format, file size = 541 KB; Latin
The institutes of Justinian, MS Word format, file size = 466 KB; Latin

The Codex of Justinian

The Codex of Justinian, PDF format, file size = 3,610 KB; Latin
The Codex of Justinian, MS Word format, file size = 4,109 KB; Latin

Credits:

Robert G. Natelson, Senior Fellow in Constitutional Jurisprudence at the Independence Institute; then Professor of Law, The University of Montana

assisted by Rebecca Natelson Chertudi (then age 16) –  three-times perfect score on the National Latin Exam and National Merit Scholar; Washington and Lee University, Class of 2009.