In the Edo period, the sonnoka (people with reverence for emperors) emphasized the "unbroken line of emperors" which implied the incredibly long history and continuity of the imperial family, to heighten respect and support for emperors.
江戸時代、尊皇家は天皇への尊崇と支持を高めるため、天皇家の大変な古さと不変性という「万世一系」を強調した。