Институции

Институции Гая — учебник римского права, составленный древнеримским юристом Гаем во 2-м веке НЭ.

Обретение
В средние века сочинение Гая было утрачено.

В 1816 г. Нибур, просматривая рукописи Веронской библиотеки, вскрыл в одном палимпсесте, содержавшем письма св. Иеронима, полную рукопись древнего римского юриста, а Савиньи угадал в ней Институции Г. Рукопись была несколько раз пересмотрена; теперь текст ее совершенно испорчен различными химическими средствами, употреблявшимися для его вскрытия.

(ЭСБЕ)

The work was lost to modern scholars, until, in 1816, a palimpsest was discovered by B. G. Niebuhr in the chapter library of Verona, in which some of the works of St. Jerome were written over some earlier writings, which proved to be the lost work of Gaius. The greater part of the palimpsest has, however, been deciphered with the help of August von Bethmann-Hollweg, and the text is now fairly complete. More recently, two sets of papyrus fragments have been found. The discovery of Gaius' work has thrown a flood of light on portions of the history of Roman law which had previously been most obscure. Much of the historical information given by Gaius is wanting in the compilations of Justinian, and, in particular, the account of the ancient forms of procedure in actions. In these forms can be traced "survivals" from the most primitive times, which provide the science of comparative law with valuable illustrations, which may explain the strange forms of legal procedure found in other early systems.

(engwiki)

Упоминают
"Бревиарий" Алариха

"Институции" Юстиниана

Боэций