The Roumanian delegate, Joan Bratianu, arrived at Düsseldorf on Good Friday 1866, to lay the offer of the Roumanian people before Prince Charles and his father. In an audience granted by the latter on the following day, March 31, Bratianu announced the intention of the Lieutenance Princière, inspired by Napoleon III., to advance Prince Charles Anthony's second son, Charles, as a candidate for the throne of the Principalities. Bratianu succeeded in obtaining a private interview with Prince Charles the same evening, in order to acquaint the latter with the political situation, and to point out the danger which must inevitably be incurred if the present Provisional Government remained in power. Prince Charles replied that he possessed courage enough to accept the offer, but feared that he was not equal to the task, adding that nothing was known of the intentions of the King of Prussia, without whose permission, as chief of the family, he could not take so important a step. He therefore declined for the moment to give any definite answer to the proposals of the Roumanian Government. Bratianu returned to Paris, after promising to take no immediate steps in the matter. Prince Charles Anthony without delay addressed a memorial regarding this offer to the King of Prussia, and clearly defined the circumstances which had led to his taking this step. A similar communication was forwarded to the President of the Prussian Ministry.
A few days later Prince Charles arrived in Berlin, and at once visited the King, the Crown Prince, and Prince Frederick Charles, as he reported in a letter to his father:
"The King made no mention of the Roumanian question at the interview, but the Crown Prince, on the other hand, entered into a minute discussion with me, and did not appear to be at all against the idea. The only thing that displeased him was that the candidature was inspired by France, as he feared that the latter might demand a rectification of the frontier from Prussia in return for this good office. I replied that I did not consider that the Emperor Napoleon had thought of such a bargain, but had been induced to take the initiative in this matter by family feeling rather than by any selfish consideration. The Crown Prince, moreover, considered it a great honour that so difficult a task had been offered to a member of the House of Hohenzollern. Prince Frederick Charles also at once started upon a minute discussion of the Roumanian question. He seemed to be intimately acquainted with the issue, and volunteered the opinion that I was intended for better things than to rule tributary Principalities: he therefore advised me to decline the offer."
The following telegram, published in the Press, was handed to Prince Charles as he was sitting with his comrades at the regimental mess-table:
"Bucharest, 13th April.
"The Lieutenance Princière and Ministry have announced the candidature of Prince Charles of Hohenzollern as Prince of Roumania, under the title of Charles I., by means of placards at the street corners; it is rumoured that the Prince will arrive here shortly. The populace appeared delighted by the news."
The Prince at once visited Colonel von Rauch, who had been entrusted with the delivery of Prince Charles Anthony's memorial to the King, and learnt that an answer would be sent on April 16. The following report was despatched to Prince Charles Anthony by his messenger on the 14th: "I was commanded to attend their Majesties at the Soirée Musicale yesterday evening. The King took me into a side room and expressed himself as follows: 'I have not yet replied to the Prince, because I am still waiting for news from Paris, as the Porte has declared its intention of recalling its ambassador from the Conference if the election of a foreign prince is discussed.
"'Should the protecting States have regard to this declaration of the Porte, the election of a Hohenzollern prince would be rendered impossible; on the other hand, should the majority decide for a foreign prince, and the coming Chamber in Bucharest follow their example, the whole matter would enter upon a new phase. However, that I may not keep the Prince waiting, I shall express my opinions shortly as to the future acceptance or refusal of the Roumanian crown.'"
The King of Prussia forwarded the following autograph letter to the young Hohenzollern prince early the next morning:
"Your father has, no doubt, imparted to you the enclosed (telegram from Bratianu). You will remain quite passive. Great obstacles have arisen, as Russia and the Porte are so far opposed to a foreign prince.
"WILLIAM."
The telegram ran thus: