Nicolaas Hartingh

From Tegal he was sent to Kartasura to be trained as interpreter and eventually worked in this capacity for the company in Semarang and later in Surabaya where he was also appointed as secretary.

[7] In these tense circumstances, Governor Hartingh came to the conclusion that the only way of resolving this problem was by negotiating with Prince Mangkubumi and offering a path to peace.

The points of the agreement were then outlined in the text of the Treaty of Giyanti that was signed on 13 February 1755 by Governor Hartingh as Commissioner Plenipotentiary of the Dutch East India Company, Prince Mangkubumi and Susuhan Pukubuwono III along with his allies.

Governor Hartingh represented the Dutch East India Company at the investiture of Prince Mangkubumi as Sri Sultan Hamengkubuwono I of Yogyakarta in March 1755.

For his role in establishing peace between Pakubuwono III and Mangkubumi, Hartingh won high praise from his superiors, including the Heeren XVII.

Governor Hartingh again used his skills of diplomacy to bring an end to the hostilities known as the Third Javanese War of Succession, by convincing the Pakubuwono III to part with more of his territory, this time in favour of Raden Mas Saïd who was installed as Sri Mangkunegara I of the Princely State of Mangkunegaran in 1757.

A detailed historical account of the military campaigns between 1741 and 1757 was penned (most likely by Hartingh) as "Kort verhaal van de Javasche oorlogen".

There he was nominated in 1762 as President of the Heemraden and in 1765 he was appointed Full Counsellor of the Indies (Raad Ordinair van Indië) to the Vice-Roy's Council by the Heeren XVII.