In September of the same year, the affair began to advance. Prim sent Salazar, a Spanish gentleman, to Germany with a semi-official commission to invite the Prince to become a candidate, and gave him a letter to a German acquaintance who would procure him an introduction to the Prince. This German acquaintance was no other than Herr von Werther, Prussian Ambassador at Vienna. If we remember the very strict discipline which Bismarck maintained in the Diplomatic Service we must feel convinced that Werther was acting according to instructions.[9] He brought the envoy to the Prince of Hohenzollern; the very greatest caution was taken to preserve secrecy; the Spaniard did not go directly to the castle of Weinburg, but left the train at another station, waited in the town till it was dark, and only approached the castle when hidden from observation by night and a thick mist. He first of all asked Prince Charles himself to accept the throne, and when he refused, offered it to Prince Leopold, who also, though he did not refuse point-blank, left no doubt that he was disinclined to the proposal; he could only accept, he said, if the Spanish Government procured the assent of the Emperor Napoleon and the King of Prussia. Notwithstanding the reluctance of the family to take the proffered dignity, Herr von Werther (and we must look on him as Bismarck's agent[9]) a fortnight later travelled from Munich in order to press on the Prince of Roumania that he should use his influence not to allow the House of Hohenzollern to refuse the throne. For the time, however, the subject seems to have dropped. A few months later, for the third time, the offer was repeated, and now Bismarck uses the whole of his influence in its favour. At the end of February, Salazar came on an official mission to Berlin; he had three letters, one to the King, one to Bismarck, one to the Prince. The King refused to receive him; Prince Leopold did not waver in his refusal and was supported by his father; their attitude was that they should not consider the matter seriously unless higher reasons of State required it. With Prince Bismarck, however, the envoy was more successful; he had several interviews with the Minister, and then left the city in order that suspicions might not be aroused or the attention of the French Government directed to the negotiations. Bismarck pleaded with great warmth for the acceptance of the offer; in a memoir to the King, he dwelt on the great importance which the summons of a Hohenzollern prince to the Spanish throne would have for Germany; it would be politically invaluable to have a friendly land in the rear of France; it would be of the greatest economic advantage for Germany and Spain if this thoroughly monarchical country developed its resources under a king of German descent. In consequence of this, a conference was held at Berlin, at which there were present, besides the King, the Crown Prince, Prince