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In page Onitsha:

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After their arrival on the east bank (Onicha-mmili, "Onitsha-on-water", see above), the community gradually became a unitary kingdom, evolving from a loosely organized group of "royal" villages to encompass "non-royal" villages comprising Igala settlers, and the native Igbos to form a more centralized entity.[2] Eze Aroli was apparently the first genuinely powerful Obi of Onitsha, the ruler of the city.[3]