Kammala jumla mai zuwa: Kamar yadda kasar Sin ta kasance a karkashin mamayar Daular Mongol, duk jihohin kasar Sin da ke karkashin mulkin Mongol na kasar Sin. A farkon 1292, Kublai Khan an ce ya aika da wani bincike zuwa arewacin Borneo, kafin ya tashi zuwa
mamayewar Java a shekara ta 1293. Sakamakon wannan yaƙin, an yi imanin cewa yawancin mabiyansa ban da sauran 'yan kasuwar Sinawa daga baya suka zauna suka kafa nasu mulkin mallaka a Kogin Kinabatangan. A karni na 14, Brunei ta zama jihar Majapahit amma a 1370 ta canja wurin biyayya ga daular Ming ta China. Maharaja Karna na Borneo sannan ya ziyarci Nanjing tare da danginsa har mutuwarsa. An gaje shi da dansa Hsia-wang wanda ya yarda ya aika da haraji ga kasar Sin sau ɗaya a kowace shekara uku. Tun daga wannan lokacin, jiragen ruwa na kasar Sin sun zo arewacin Borneo tare da kayan yaji, gidajen tsuntsaye, shark fins, camphor, rattan da lu'u-lu'u. Yawancin 'yan kasuwar Sinawa daga baya sun zauna a Kinabatangan, kamar yadda aka bayyana a cikin bayanan Brunei da Sulu. 'Yar'uwar' yar Ong Sum Ping (Huang Senping), Gwamna na mazaunin Sinawa sannan ya auri Sultan Ahmad na Brunei. Wataƙila saboda wannan alaƙar, an gano wurin binne tare da akwatin gawa na katako 2,000, wasu da aka kiyasta sun kai shekaru 1,000, a cikin Agop Batu Tulug Caves a yankin Kinabatangan. An yi imanin cewa irin wannan al'adun jana'izar 'yan kasuwa ne suka kawo daga Kasar Sin da Indochina zuwa arewacin Borneo kamar yadda aka gano akwatunan gawa na katako iri ɗaya a waɗannan ƙasashe. Bugu da ƙari tare da gano kayan yumbu na kasar Sin daga jirgin ruwa a Tanjung Simpang Mengayau wanda aka kiyasta daga 960 zuwa 1127 AD na daular Song da Vietnamese Đông Sơn drum a Bukit Timbang Dayang a tsibirin Banggi wanda ya wanzu tsakanin shekaru 2,000 zuwa 2,500 da suka gabata.