Incident to the censorship was the _visita de navíos_, or search of all vessels on their arrival, regarded as an indispensable duty to prevent the importation of forbidden books and the immigration of suspected heretics and Judaizers, as well as to ascertain whether, during the voyage, any one on board had committed acts subjecting him to inquisitorial jurisdiction. As in Spain, this performance inevitably led to friction with the secular authorities of the sea-ports. As early as 1584 there is a prosecution of Hernando de Moxica, alcalde mayor, and of Diego de Yepes, regidor of Vera Cruz, for impeding the commissioner in this work and speaking disrespectfully of it, resulting in a fine of five hundred pieces each, with excommunication until they should withdraw their opposition.[515] Of course it was difficult to control the officials of the tribunal in the matter of fees and to keep the peace between them and the royal representatives as to questions of precedence, points which the Concordia of 1633 endeavored to regulate by fixing the fee at four pesos, of which two accrued to the commissioner and one each to the alguazil and notary, an amount never to be exceeded, no matter how many assistants might be employed, while existing orders were to be strictly observed as to their concurrence with the royal officials.[516] Of course it was not easy for the Inquisition to maintain supervision over so extended a coast. In a consulta of February 15, 1620, the Suprema informed Philip III that there had recently been printed in Holland large numbers of Spanish Bibles to be sent to the colonies and, as the Inquisition was unable to prevent their introduction unaided, the king was asked to instruct the royal officials to exercise greater vigilance. To this he assented and the request was renewed, June 28, 1629. It was probably to meet this that, in 1633, an agreement between the Suprema and the Council of Indies permitted the appointment of an alguazil in Yucatan to aid in searching the ships arriving at the ports.[517] * * * * *