‘Scriptura recepta et usitata’

Summary It is generally taken for granted that the 426 Law of Citations ( Lex citandi ) of the emperor Valentinian III had no impact on the composition of Justinian’s Digest and that it had already been repealed on 15 December 530 with the promulgation of Const. Deo auctore , announcing the composition of the Digest . In this article it is contended that the Lex citandi was only repealed on 16 December 533, with the promulgation of the Digest on which it had a considerable impact since it was referred to in Const. Deo auctore and was the main inspiration of the Index florentinus , which is to be regarded as an expanded version of the Lex citandi .