The Yamani Empire consists of a group of islands to the northwest of Tortall and west of Scanra in the Emerald Ocean. They are ruled by an Emperor and have very strict ettiquette, particularly regarding the showing of emotions. Their palace women were taught to fight, but only to defend themselves, as Keladry of Mindelan learned when she lived there for 6 years of her childhood. The women of the Islands use the naginata, which is a Glaive in Common (the language Tortall uses), and have fans (shukusen) that look harmless but are really deathly as the fans are made of steel. It is also a game in which girls would toss the fan and catch it by its handle. The ladies also wear kimono. The Yamani are also known to wear their hair in topknots.
Known Yamani include Princess Shinkokami, Lady Haname, Prince Eitaro, and Lady Yukimi. Also mentioned in "Page" is Princess Chisakami, the original princess engaged to Roald, only to die in an earthquake.
The Yamani Empire's greatest treasures are the swords of law and duty. At some point in 447 H.E., Scanran pirates had attempted to steal the swords. After a Yamani lady-in-waiting protecting the swords was killed, Ilane and Keladry of Mindelan protected the swords until Yamani guardsmen had arrived. This helped to clear the way for peace treaties between Tortall and Yamani.
Tamora Pierce based the Yamani culture on the culture of ancient Japan. So far Tamora Pierce has no plans to write a story set in the Yamani Islands themselves, but she also has said that this might still change.