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In page Gusuku:
"Earlier studies pointed to the similarity between gusuku in Amami, northern Okinawa Island and medieval mountain fortifications of Japan. Takanashi went further claiming that these fortifications were indeed medieval mountain fortifications. He considered the possibility that there were gaps in time among (1) the beginning of the archaeological sites, (2) the construction of defensive structures and (3) the applications of the name of gusuku. He re-evaluated Nakamatsu's sacredness theory and presented a working hypothesis that gusuku in Amami were of secondary origin, possibly related to the introduction of the noro priestess system by the Ryukyu Kingdom.[4]
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