Emperor Chuai
A.k.a. Prince Tarashi Naka
Emperor Chûai was Jing*ucirc;'s "husband". He was divinely told to go to Korea to conquer, but wished to travel to Kyushu instead.
Angry, the kami that had ordered him struck him dead. Jingû succeeded him.
Sources
Aoki, Michiko Y. Ancient Myths and Early History of Japan. Pages 37-38.