thumb|200px|Imperial Seal of Japan
thumb|200px|Imperial Seal of Japan
was the collective name for the four cadet branches of the Imperial House of Japan, which were until 1947 entitled to provide a successor to the Chrysanthemum Throne if the main line failed to produce an heir. The heads of these royal houses held the title of , regardless of their genealogical distance from the reigning Emperor of Japan, as the term seshū in their designation meant that they were eligible for succession.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).