Yoshimori Hyakushu / Shinobi Uta (100 Ninja Poems) is a collection of 100 short Japanese Waka poems that are dedicated to conserving instructional statements that teach and instruct on various elements of ninjutsu. They are positioned and collected into block groups which appear to have similar themes and are attributed to the famous 12th century warrior and possible “shinobi”, Ise no Saburo Yoshimori. However, there is no documented evidence for this and the first recorded account of these 100 poems occurs in a manuscript written in 1612 by Ogasawara Saku’un Katsuzo, which was printed 4 times during an 11 year period between 1653 to 1664 and titled: Gunpo Jiyoshu, which translates as ‘The Collected Way of the Samurai Military Arts’ and is translated here in this book. A short selection of these 100 poems then reappear in the 1676 ninjutsu manuscript The Bansenshukai, written by Fujibayashi Yasutake. In this ninja document the poems are renamed the Shinobi-uta (or Ninka) which translates directly as 'ninja poems'. Some of the poems in this latter document were edited and changed from the original text to some extent but have only slight differences in most cases, with the exception of one poem having a reversal in meaning.