[2][6] Han Tjien Kong converted to Islam at an unknown date, and subsequently assumed the Javanese name of Soero Pernollo.
[6] Throughout this period, Soero Pernollo was Breton's right-hand man, initially as gezaghebber, or overseer, of three merchant ships, then as harbourmaster of Surabaya, the most important commercial entrepôt in East Java.
[6] During the consolidation of Dutch rule in the Eastern Salient, Soero Pernollo was appointed politiehoofd, or police chief, of Besuki and Panarukan in 1764 with the Javanese noble title of Ngabehi.
[3] It was thanks to his influence that his younger brother, Kapitein Han Bwee Kong, eventually managed to acquire the lease for the districts of Besuki in 1768, and of Panarukan in 1777.
[1][3][6] One of his daughters married a fellow ally of the Dutch East India Company, Pakunataningrat I, Sultan of Sumenep (reigned 1812 - 1854).