ACH: Extensive Greek culture in east Africa

With a POD anytime after the fall of Rome, how do you get substantial and lasting Greek culture on the east coast of Africa south of the Red Sea? It doesn't need to be properly Greek, or ruled from Greece but an extensive cultural or linguistic influence that lasts.
 
Well, the easiest is the Byzzies keeping Egypt and the Levant, then establishing a presence in the Red Sea, then creating links with the East African peoples (particularly Ethiopia).
 
Have the initial spread of Islam turn eastward, through Persia and on into Bactria and towards India. The Levant and Egypt remain under the control of the Eastern Roman Empire. Gradually, Roman trade spreads down the Nile, and regular trade links with Aksum thrive. As sailing technology improves, Greek traders round the Horn of Africa regularly and begin to establish trade posts along the eastern coast, particularly in the culturally Somali areas of the Horn. These trade posts deal mainly in gold, ivory and wax. Greek becomes something of a trade language in the Horn and on southward somewhat, and Greek traders increasingly settle in the area to continue to take advantage. These eventually evolve into Greek mini-colonies of a sort.

Centuries later, Islam reaches from Arabia to Tibet to northern India and Southeast Asia and up into the Steppes, Europe and North Africa are mostly various denominations of Christian, and Egypt is mostly Coptic. The Greek-speaking enclaves around the Horn of Africa are peopled by largely ethnically Somali miaphysite Christians with some Greek blood mingling in their genetics, and they speak and read Greek and trade extensively with India and the Far East.
 
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