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In page Andriamanelo:

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Many of the innovations attributed to Andriamanelo were not his personal invention. Rather, their origins can be traced back to the southeastern part of the island that the Hova had left behind as they migrated into the central highlands. Astrology, for instance, had been introduced early to the island by way of trade contacts between coastal Malagasy communities and Arab seafarers. Similarly, archaeological evidence proves the existence of iron implements in Madagascar at least four centuries prior to the war between Andriamanelo and the Vazimba,[8] suggesting that while the technology was not discovered during his reign, Andriamanelo may have been among the first sovereigns in Imerina to make wide-scale use of it in military campaigns.[9]