was a Japanese daimyo

Daimyo

is a generic term referring to the powerful territorial lords in pre-modern Japan who ruled most of the country from their vast, hereditary land holdings...

 who ruled the Aizu

Aizu

is an area comprising the westernmost third of Fukushima Prefecture in Japan. The principal city of the area is Aizuwakamatsu.During the Edo period, Aizu was a feudal domain known as and part of Mutsu Province.-History:...

 domain. He was the son of Gamō Ujisato

Gamo Ujisato

was a Japanese daimyo of the Sengoku and Azuchi-Momoyama periods. The heir and son of Gamō Katahide, lord of Hino Castle in Ōmi Province, he later held Matsusaka and finally Aizuwakamatsu Castle in Mutsu Province...

. A Christian

Christian

A Christian is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus of Nazareth as recorded in the Canonical gospels and the letters of the New Testament...

, Hideyuki was moved to Utsunomiya (180,000 koku) in Shimotsuke after his father died in 1595. In 1600, he was given Aizu

Aizu

is an area comprising the westernmost third of Fukushima Prefecture in Japan. The principal city of the area is Aizuwakamatsu.During the Edo period, Aizu was a feudal domain known as and part of Mutsu Province.-History:...

, worth 600,000 koku. This had been part of his father's fief.

Hideyuki's eldest son Tadasato succeeded him in 1612.