Due to his advocates and his will to further his career, the management of the
Danish East India Company appointed him as (assistant councillor) and (second-in-command) of the Danish colony of
Tranquebar in 1703. Subsequently, Hassius departed from
Copenhagen on the ship
Fridericus Quartus and reached Tranquebar in June 1704. Upon reaching Tranquebar, Hassius discovered that the governor,
Jørgen Bjørn, had died on 12 June, and Hassius consequently assumed the governorship of the colony on 1 July with great splendor.
Administration and trade On 26 September 1707, Hassius's status as governor was approved by royal decree. Hassius did not sacrifice much for the company, but instead used the system to his own personal and economic advantage. Both he and the members of the
privy council () were highly corrupt. Hassius used his fortune on private business deals and especially private trade, which was forbidden by the company. Notwithstanding, because of his heat intolerance, he had already requested his return to
Denmark–Norway on 26 October 1708, yet the privy council convinced him to stay. Again in 1709 and 1714, Hassius requested his dismissal. Despite the corruption and private trade, the regional trade initially increased, with three to four ships arriving from Copenhagen every year. Simultaneously, vessels like
Dansborg and
yachts like
Gyldenløve,
Prins Wilhelm, and
Elefanten were regularly trading at ports in the
Bay of Bengal. As such, from 1699 to 1709, the had a surplus of 189,665
Danish rigsdaler. However, in the subsequent years, regional commerce decreased under Hassius's leadership. Meanwhile, the
Great Northern War and
a new plague outbreak halted the regular shipping from Copenhagen, and the few
cargoes that reached Denmark from India had poor marketing. Moreover, several accidents occurred, and in the span of a few years, the company lost many of its best ships. In 1711, the colony's finances were in a meager state, while salaries were irregularly paid and officials were forced to use bribery and gifts. Additionally, there was no supervision of the officials, and Hassius took advantage of this with recklessness. As a result, Hassius became extremely wealthy from his tenure as governor. The D.E.I.C. quickly became dissatisfied with Hassius's arbitrariness and violent behavior and subsequently sent a commissioner to investigate the conditions in the colony. The commissioner, Hendrik Bonsack, reached Tranquebar on 7 October 1710, but accomplished little.
Evacuation of Dannemarksnagore The decrease in shipping also affected the Danish lodge,
Dannemarksnagore, in
Bengal, which had not received supplies from Tranquebar for a couple of years. Consequently, the
governor of Dannemarksnagore,
Rasmus Hansen Attrup, deemed it necessary to obtain loans from a local
Mughal magnate, but when these loans could not be repaid, the Bengali government took the opportunity to intervene. Subsequently, Dannemarksnagore was besieged in 1714, while Attrup and the Danes fled by ship to Tranquebar,'''''' saving
goods worth 33,293 Danish rigsdaler. After Attrup abandoned Dannemarksnagore, Hassius became openly hostile to him, describing him as
warmongering and non-understandable. Hassius accused Attrup of already distributing some of the money saved from Bengal, and responded by declaring that the rest of the sum was going to fund a new
sail and
rigging for a ship. However, in reality, the remaining sum was likely used for Hassius's personal interests. From the Summer of 1715 to the following Winter, Tranquebar involved itself in a war between the
Kingdom of Thanjavur and the
Maravar Kingdom, leasing the former two armed vessels. As part of this agreement, the two nearby villages of Tevanur and Cattuchery were acquired by Tranquebar for a yearly payment of 100
rupees. Nonetheless, disputes over the terms of the lease and allegations of bribery resulted in prolonged internal conflicts within Tranquebar and temporarily strained relations with Thanjavur. Eventually, Hassius became involved in numerous legal proceedings and cases. Accordingly, on 16 August 1716, Hassius was dismissed as governor after the ship,
Salvator Mundi, reached Tranquebar on 17 March following an unusually prolonged interruption in communication with Denmark–Norway. This was received with sorrow throughout the colony and nearby cities, although many others were relieved.''''
Subsequently, he departed from Tranquebar on 22 October 1716 with his wife, children, and a large fortune, reaching Copenhagen in 1717. Additionally, he was found guilty of abuse of power on 16 December and had transferred the governorate to Christen Brun Lundegaard on 20 October. Despite the British East India Company offering him a more convenient ship, Hassius decided to undertake the return voyage with the Salvator Mundi''. == Relationship with missionaries ==