Somali colonial empire

If you unified Somalia in the 1200s and made it a stable state and regional power, then conceivably it would include much of Ethiopia (not just the Ogaden either), Socotra and much of coastal Yemen and Oman, probably the Swahili states, northern Madagascar, and the Maldives. Some sort of settler colonialism on the Mascarenes, Seychelles, and Diego Garcia would be ideal, but you'd need an actual reason for it, since the Arabs and probably Somalis knew about those islands yet never settled them.
 
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