[CALLISTRATUS libro I quaestionum. ] §1.3.38.prNam imperator noster Seuerus rescripsit in ambiguitatibus quae ex legibus proficiscuntur consuetudinem aut rerum perpetuo similiter iudicatarum auctoritatem uim legis optinere debere.
[CALLISTRATUS, Questions, book 1] For our Emperor Severus rescripted that, in ambiguities which arise from laws, custom or the authority of cases consistently decided in a similar manner ought to have the force of law.