Aspects of this topic are discussed in the following places at Britannica.
...reaching the port of Sofala in East Africa on June 14. After calling briefly at Mozambique, the Portuguese expedition sailed to Kilwa, in what is now Tanzania. The ruler of Kilwa, the amīr Ibrāhīm, had been unfriendly to Cabral; da Gama threatened to burn Kilwa if the Amīr did not submit to the Portuguese and swear loyalty to King Manuel, which he then did.
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