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The site said to be identical with the ancient trading post of Mundus (Ancient Greek: Μούνδος) that is described in the Periplus of the Erythraean Sea, an anonymous account by a Greek Alexandrian salesman from the 1st century CE.
"Two days' sail, or three, beyond Malao is the market-town of Mundus, where the ships lie at anchor more safely behind a projecting island close to the shore. There are imported into this place the things previously set forth, and from it likewise are exported the merchandise already stated, and the incense called mocrotu. And the traders living here are more quarrelsome."— Chap.9.
A large collection of cairns of various types lie near the city. Excavations here have yielded pottery and sherds of Roman glassware from a time between the 1st and 5th centuries. Among these artefacts is high-quality millefiori glass. Dated to 0-40 CE, it features red flower disks superimposed on a green background. Additionally, an ancient fragment of a footed bowl was discovered in the surrounding area. The sherd is believed to have been made in Aswan (300-500 CE) or Lower Nubia (500-600 CE), suggesting early trading ties with kingdoms in the Nile Valley.
Legendary Arab explorer Ahmad ibn Mājid wrote of Heis and a few other notable landmarks and ports of the northern Somali coast, including Berbera, the Sa'ad ad-Din islands aka the Zeila Archipelago near Zeila, Alula, Ruguda, El-Sheikh and El-Darad.
The Habr Je'lo derived a large supply of frankincense from the trees south in the mountains near Heis. This trade was lucrative and with gum and skins being traded in high quantity, Arab and Indian merchants would visit these ports early in the season to get these godos cheaper than at Berbera or Zeyla before continuing westwards along the Somali coast. During the British Somaliland period the recorded statistics of Heis show it as a leader alongside Maydh in the east with hundreds of thousands of hides and being the leading exporter of tanned skins with 16,000 reaching Berbera taken by Habr Je'lo traders by dhow. As well Heis exported a large quantity of skins and sheep to Aden. Heis also imported a significant amount of goods from both the Arabian coast and western Somali ports and reached nearly 2 million rupees by 1903.
In modern times Heis is no longer as commercially active compared to the past but it remains a coastal settlement of the Habr Je'lo and locals also fish. The large Asli Maydi frankincense company harvests the trees in the mountains south of the town and across Sanaag.
- Rodríguez (2018). "Against All Odds: The History of Archaeological Research in Somaliland and Somalia". Northeast African Studies. 18 (1–2): 271–310. doi:10.14321/nortafristud.18.1-2.0271. hdl:10261/216289. JSTOR 10.14321/nortafristud.18.1-2.0271.
- The Journal of the Royal Geographical Society, Volume 19, p. 63, 1848
- "Mundu" (in German). University of Bern. Archived from the original on 2007-08-15.
- Periplus of the Erythraean Sea, Schoff's 1912 translation
- Newsletter of the Society of Africanist Archaeologists in America, Issues 8-13. Department of Archaeology, University of Calgary. 1976. p. 5. Retrieved 25 September 2014.
- Periplus of the Erythraean Sea
- Meyer, Carol (1992). Glass from Quseir Al-Qadim and the Indian Ocean Trade, Issue 53. Oriental Institute of the University of Chicago. p. 37. ISBN 0918986877. Retrieved 25 September 2014.
- Hatke, George (2013). Aksum and Nubia: Warfare, Commerce, and Political Fictions in Ancient Northeast Africa. NYU Press. p. 152. ISBN 978-0814762837. Retrieved 16 September 2014.
- "Ibn Majid". Medieval Science, Technology, and Medicine: An Encyclopedia. Routledge. 2005. ISBN 978-1-135-45932-1.
- Pankhurst, Richard (1965). "The Trade of the Gulf of Aden Ports of Africa in the Early Nineteenth and Early Twentieth Centuries". Journal of Ethiopian Studies. 3 (1): 36–81.
- Great Britain, House of Commons (1905). Sessional papers Inventory control record 1, Volume 92. HM Stationary Office. p. 385.