A document of the year 1332 describes a sale made by a certain Geoffroy de Saint Léger, a _clerc libraire_, to Gérard de Montagu, _avocat du roy au parlement_. Geoffroy acknowledges to have sold, ceded, assigned, and delivered to the said Gérard a book entitled _Speculum Historiale in Consuetudines Parisienses_, comprised in four volumes, and bound in red leather. He guarantees the validity of this sale with his own body, _de son corps mesme_. Gérard pays for the book the sum of forty Parisian livres, with which sum Geoffroy declares himself to be content, and paid in full.[371] It appears that the sale of a book in the fourteenth century was a solemn transaction, calling for documentary evidence as specific as in the case of the transfer of real estate. In the year 1376, Jean de Beauvais, a _librarius juratus_, is recorded as having sold various works, including the Decretals of Gregory IX., illustrated with miniatures, a copy of _Summa Hostiensis_, 423 parchment leaves, illustrated with miniatures, and a codex of Magister Thomas de Maalaa.[372] In the year 1337, Guidomarus de Senis, master of arts and _librarius juratus_, renews his oath as a taxator. He seems to have put into his business as bookseller a certain amount of literary gaiety, if one may judge from the lines added at the end of a parchment codex sold by him, which codex contains the poems of Guillaume de Marchaut. The lines are as follows: _Explicit au mois d’avril, Qui est gai, cointe et gentil, L’an mil trois cent soixante et onze. D’Avril la semaine seconde, Acheva à un vendredi, Guiot de Sens c’est livre si, Et le comansa de sa main, Et ne fina ne soir ne matin, Tant qu’il eut l’euvre accomplie, Louée soit la vierge Marie._[373] Philip the Bold, Duke of Burgundy, was one of the more important book collectors of his time. In 1386, the Duke paid to Martin L’Huillier, dealer in manuscripts and bookbinder, sixteen francs for binding eight books, six of which were bound in grain leather.[374] The Duke of Orleans also appears as a buyer of books, and in 1394, he paid to Jehan de Marsan, master of arts and dealer in manuscripts, twenty francs in gold for the _Letters of S. Pol_, bound in figured silk, and illuminated with the arms of the Duke. Four years later, the Duke makes another purchase, paying to Jehan one hundred _livres tournois_ for a Concordance to the Bible in Latin, an illuminated manuscript bound in red leather, stamped.