Diary of John Quincy Adams, volume 2 Previous document in volume 13. Next document in volume 15. 461 14. JQA 14. Adams, John Quincy 14. Justinian's Inst.1 Foster's Cr. Law. Gibbon &c. 1. Justinian's Institutes, a textbook of Roman law and a foundation of continental law, originally issued by Justinian I in 533.