Oda Nobunaga

A photocopy of a portrait of Nobunaga allegedly drawn by a missionary. Collection of Sanpoji Temple.
The whole mountainside was a great slaughterhouse and the sight was one of unbearable horror

The changing character of power through Nobunaga, Hideyoshi and Ieyasu is reflected in a well known idiom:

Political situation in Japan circa 1582. Purple area was territory controlled by the Oda in 1560, grey area was territory Nobunaga controlled at the time of his death in 1582.

He built iron-plated warships and imported saltpeter to produce gunpowder, while also promoting the manufacture of artillery and ammunition.