In 1447, Iizasa Choisai Ienao dedicated his life to worshipping at the Katori Shinto Jinja (shrine). While worshipping there one day, engaged in martial arts training, which was an aspect of his Shinto discipline and purification, a divine being appeared to him and presented him with a book on strategy, written reportedly by divine hands. This book, called the HEIHO ...
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