With the head of the Swedish branch of the Gottorps, the crown prince Adolphus Frederick, things had been arranged by the exchange of 1750; but an attempt to make a similar arrangement with the chief of the elder Gottorp line, the cesarevitch Peter Feodorovich, had failed.
It was through his initiative, too, that the convention of KlosterSeven was signed (loth of September 1757), and on the 4th of May 1758 he concluded a still more promising treaty with France, whereby, in consideration of Denmark's holding an army-corps of 24,000 men in Holstein till the end of the war, to secure Hamburg, Lubeck and the Gottorp part of Holstein from invasion, France, and ultimately Austria also, engaged to bring about an exchange between the king of Denmark and the cesarevitch, as regards Holstein.
On the next day the emperor William officially announced the betrothal of the Cesarevitch (afterwards the tsar Nicholas II.) to the princess Alix of Hesse, a granddaughter whom the queen had always regarded with special affection.
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