§ 12. The bishops and chief men shall elect officials for each province who shall be qualified and able to administer its government, etc. § 19. That there may be no opportunity for fraud or loss to the provinces, we order that, in the purchase and sale of all kinds of produce [grain, wine, oil, etc.] and in the payment and receipt of money, only those weights and measures shall be used which we have established and put under the control of the pope and of the senate. 37. The Emperor has the Right to Confirm the Election of the Bishop of Rome, _ca._ 650. A Letter from the Church at Rome to the Emperor at Constantinople, Asking him to Confirm the Election of their Bishop. Liber Diurnus, no. 58, Rozière's edition, pp. 103 ff; Von Sickel's edition. pp. 47 ff. For a long time the emperor at Constantinople had exercised the right of confirming the election of the bishop of Rome. No one could be ordained and consecrated pope until his election had been confirmed by the emperor. The _Liber Diurnus_ is a collection of letters or formulas which were used by the papal secretaries as models in drawing up the pope's letters. This particular collection was in use at the papal court from about 600 to 900 A.D. When it became necessary to write to the emperor at Constantinople to secure his confirmation of the election of a bishop of Rome, a secretary would copy this letter, inserting the proper names in the appropriate places and making such other changes in its wording as might be necessary to fit the particular case.