Periplus of the Erythraean Sea in the context of "Zeila"

The Erythraean Sea (Ancient Greek: Ἐρυθρὰ Θάλασσα, Erythrà Thálassa, lit. 'Red Sea') was a former maritime designation that always included the Gulf of Aden, and at times other seas between Arabia Felix and the Horn of Africa. Originally an ancient Greek geographical designation, the term was used throughout Europe until the 18th and 19th centuries. The area referred to by this name frequently extended beyond the Gulf of Aden—as in the famous 1st-century Periplus of the Erythraean Sea—to designate all of the present-day Red Sea, Arabian Sea, Persian Gulf, and Indian Ocean as a single maritime area.

The history of Ethiopia in the Middle Ages roughly spans the period from the decline of the Kingdom of Aksum in the 7th century to the Gondarine period beginning in the 17th century. Aksum had been a powerful empire during late antiquity, appearing in the Periplus of the Erythraean Sea and mentioned by Iranian prophet Mani as one of the "four great kingdoms on earth", along with the Sasanian Empire of Persia, the Roman Empire, and China's Three Kingdoms. The kingdom was an integral part of the trade route between Rome and the Indian subcontinent, had substantial cultural ties to the Greco-Roman world, and was a very early adopter of Christianity under Ezana of Aksum in the mid-4th century. The use of "Ethiopia" to refer to the region dates back to the 4th century. At its height, the kingdom spanned what is now Eritrea, northern Ethiopia, eastern Sudan, Yemen and the southern part of what is now Saudi Arabia. However, by the 7th century, the kingdom had begun a slow decline, for which several possible political, economic, and ecological reasons have been proposed. This decline, which has been termed the "Post-Aksumite Period", saw extreme loss of territory and lasted until the ascension of the Zagwe dynasty.

In the late 10th century, the Kingdom of Aksum fell to a queen known as Gudit. Historians are unsure of her ethnicity and religion, but she is theorized to have been Agaw and likely non-Christian, as she targeted churches in her attacks. Confusion surrounds the period directly following her reign, but the dynasty proper is considered to have been founded by Mara Takla Haymanot in 1137. The capital moved southward from Aksum to Lalibela, where many rock-hewn churches were built. Despite the anti-Christian nature of Gudit's takeover, Christianity flourished under Zagwe rule but its territorial extent was markedly smaller than that of the Aksumites, controlling the area between Lasta and the Red Sea.

Muslin, a Phuti carpus cotton fabric of plain weave, was historically hand woven in the areas of Dhaka and Sonargaon in Bangladesh and exported for many centuries. The region forms the eastern part of the historic region of Bengal. The muslin trade at one time made the Ganges delta and what is now Bangladesh into one of the most prosperous parts of the world. Of all the unique elements that must come together to manufacture muslin, none is as unique as the cotton, the famous "phuti karpas", scientifically known as Gossypium arboreum var. neglecta. Dhaka muslin was immensely popular and sold across the globe for millennia. Muslin from "India" is mentioned in the book Periplus of the Erythraean Sea, authored by an anonymous Egyptian merchant around 2,000 years ago; it was appreciated by the Ancient Greeks and Romans, and the fabled fabric was the pinnacle of European fashion in the 18th and 19th century. Production ceased sometime in the late 19th century, as the Bengali muslin industry could no longer compete against cheaper British-made textiles.

Proto-Somalis were the ancient people and ancestors of Somalis who lived in present-day Somalia. Literature on proto-Somalis largely uses a time-frame pertaining to the 1st millennium BC and 1st millennium AD.

Arikamedu is an archaeological site in Southern India, in Kakkayanthope, Ariyankuppam Commune, Puducherry. It is 4 kilometres (2.5 mi) from the capital, Pondicherry of the Indian territory of Puducherry.

Sir Mortimer Wheeler 1945, and Jean-Marie Casal conducted archaeological excavations there in 1947–1950. The site was identified as the port of Podouke, known as an "emporium" in the Periplus of the Erythraean Sea and Ptolemy. Digs have found Amphorae, Arretine ware, Roman lamps, glassware, glass and stone beads, and gems at the site. Based on these excavations, Wheeler concluded that the Arikamedu was a Greek (Yavana) trading post that traded with Rome, starting during the reign of Augustus Caesar, and lasted about two hundred years—from the late first century BCE to the first and second centuries CE. Subsequent investigation by Vimala Begley from 1989 to 1992 modified this assessment, and now place the period of settlement from the 2nd century BCE to the 8th century CE.