Naomasa Ii was one of the loyal retainers Ieyasu Tokugawa.
Naomasa Ii was one of the Four Guardian's of the Tokugawa clan. In 1590 he received the fief of Minowa for 12,000 Koku. During the Battle of Sekigahara he was the first to climb up the walls of Gifu Castle. After being wounded at Sekigahara he received the fief of Sawayama for 180,000 Koku.
Naomasa Ii wore a red dangaie-do (armour) and a gold-horned helmet which was his trademark. He used to equip all of his army in red-lacquered armour because of it's physical impact on the opposing force. Ii's forces were known as the 'Red Devils'.