The efforts of Charles V (1500–58) to consolidate and defend his hereditary possessions gave a powerful boost to the development of public credit in western Europe. To meet a scale of expenditure which surpassed anything seen before, Imperial agents had recourse to an entirely new series of financial devices, necessity providing, as it normally did, the spur to invention. Charles V's servants exploited the facilities of the Antwerp Bourse to encourage the investing public to sink its money into government debt rather than commercial enterprises or speculations in commodities. Additional funds were raised on the credit-worthiness of provincial taxgatherers in the Low Countries. Thanks to the ingenuity of his financial advisers, the emperor survived the dramatic collapse of his position in Germany during the spring of 1552; and he was able shortly after to attempt the recovery of the Imperial bishoprics of Metz, Toul and Verdun, which the Lutheran princes had bartered away in their bid for French support.