The young Thulemeyer was educated at public expense, most probably on the royal Joachimsthalsches Gymnasium, while he was the godson of Friedrich Wilhelm I of Prussia.

On behalf of Frederick the Great, he was involved to arrange a marriage between the prince William V of Orange and the sixteen-year-old Wilhelmine of Prussia.

In 1784/1785 Thulemeyer cared for the important trading relationship between Prussia and the United States through his contacts in the Hague John Adams, and Thomas Jefferson and Benjamin Franklin in Paris.

In the meantime, the decisions of the stadholder were amazingly controversial and the prince threatened, in the presence of his wife and Thulemeyer, to leave the country.

[8] The French ambassador Marquis de Vérac, and Thulemeyer conocted a compromise whereby the Stadholder's military functions were replaced by a Council including the Princess, the Pensionaries and leading councillors of both the Patriot and Orangist factions.

Thulemeyer requested the patriots should "... moderate the revolution, disband the Free corps and accept a Franco-Prussian mediation even if it meant the return of the Stadholder to The Hague.

"[10] Thulemeyer dealt with the British Ambassador James Harris, 1st Earl of Malmesbury, but was not taken into confidence when the princess, at the end of June 1787, tried to travel with two coaches and four chaises to The Hague.

[12] On September 13, 1787, when Holland refused to apologize the Dutch Republic was occupied by Charles William Ferdinand, Duke of Brunswick.

So, playing the French game of rumour as deterrent, he relayed false information to the King supporting the most pessimistic reports on the Givet Camp.