The name of the Senzoku-Ike Pond comes from a legend where The Venerable Nichiren stopped and washed his feet to heel fatigue out of travelling on the way from Kuon-ji Temple on Mt. Minobu to Ibaraki for medical treatment. The pine tree onto which he hung his Kesa (Buddhist monk's robe) after taking it off at such a moment is the "Kesagake-no-Matsu".