Eitaro noh Nakuji (pronounced eye-TARR-oh noe nah-kah-OO-gee, soft "g") is a Yamani prince and ambassador. He accompanied Princess Shinkokami to Tortall to help the marriage between her and Crown Prince Roald go smoothly. He was accompanied by his wife on his journey.
He reportedly advised his imperial mistress to act more conventional around the prince, as men who have unconventional mothers want conventional wives. This was proven to be false.
Prince Eitaro suffers from arthritis, and it causes him a great deal of discomfort[1].