下野國
Gamō Hideyuki (蒲生 秀行, 1583 – June 13, 1612) was a Japanese daimyō who ruled the Aizu domain. He was the son of Gamō Ujisato. A Catholic, Hideyuki was moved to Utsunomiya (180,000 koku) in Shimotsuke Province after his father died in 1595. In 1600, he was given Aizu, worth 600,000 koku.