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In page Porto-Novo:

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Porto-Novo was once a tributary of the Yoruba kingdom of Oyo,[1][2] which had offered it protection from the neighbouring Fon, who were expanding their influence and power in the region. The Yoruba community in Porto-Novo today remains one of the two ethnicities aboriginal to the city. The city was originally called Ajashe (Àjàṣẹ́ in Yoruba orthography) by the Yorubas, and Hogbonu by the Gun.[citation needed]