Rath said there"s some evidence they might have already been available in the Ryukyu Kingdom (today"s Okinawa) as early as 1605, via the Philippines and then China. Another account holds that in 1611, Ryukyuan King Sho Nei sent a gift of sweet potatoes to Satsuma Domain, a powerful political entity in southern Kyushu, which had invaded his kingdom and taken over his land – one result of which is that the orange tubers 

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