The oldest known manuscript of the Key of Solomon, 1446
BnF Ital. 1524
Compilazioni di vari trattati latini d’astrologia, necromanzia, magia, medicina, ecc. is a collection of magical texts in Italian preserved at the Bibliothèque nationale de France. Folios 178v-235r contain Clavicula di Salomone dated 1446 which is apparently the oldest known manuscript of the Key of Solomon.
Source: gallica.bnf.fr / BnF