They moved to Kyoto when it became capital at the beginning of the Heian period .
About 1200 smiths gathered again in Nara when the various sects centered in Nara rose to power during the Kamakura period and needed weapons to arm their monks .
They moved to Kyoto when it became capital at the beginning of the Heian period , but about 1200 smiths gathered again in Nara when the various sects centered in Nara rose to power during the Kamakura period and needed weapons to arm their monks .