According to BBC news: A forgotten city thought to date back as far as the 10th century AD has been uncovered by a team of archaeologists in eastern Ethiopia.
Artefacts from Egypt, India and China have been found in the city in the Harlaa region.
The archaeologists also uncovered a 12th Century mosque which is similar to those found in Tanzania and Somaliland.
Archaeologists says this proves historic connections between different Islamic communities in Africa.
"This discovery revolutionises our understanding of trade in an archaeologically neglected part of Ethiopia. What we have found shows this area was the centre of trade in that region," lead archaeologist Professor Timothy Insoll from the University of Exeter said.
The team also found jewellery and other artefacts from Madagascar, the Maldives, Yemen and China.
Harlaa was a "rich, cosmopolitan" centre for jewellery making, Prof Insoll said.
"Residents of Harlaa were a mixed community of foreigners and local people who traded with others in the Red Sea, Indian Ocean and possibly as far away as the Arabian Gulf," he said.
'City of giants'
BBC Ethiopia correspondent Emmanuel Igunza says there was a local myth that the area was occupied by giants because the settlement buildings and walls were constructed with large stone blocks that could not be lifted by ordinary people.
However the archaeologists found no evidence of this....
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