Uesugi Kagekatsu
After his death in 1578, Uesugi Kagekatsu gained control of Kasugayama, after a brief series of battles with Uesugi Kagetora over the inheritance. Although Uesugi Kagekatsu was able to reunite the Uesugi clan, his forces were severely weakened by the ongoing struggle against Oda Nobunaga and the Odawara Hōjō clan. The Uesugi eventually submitted to Toyotomi Hideyoshi, and in 1598 the clan was transferred by Hideyoshi to Aizu. Kasugayama Castle was turned over to Hori Hideharu, the son of Hori Hidemasa. Hideharu built a large water moat to surround the "jōkamachi" of Kasugayama as the local populace was highly upset over the departure of the Uesugi, and in 1600 he relocated his seat to Fukushima Castle near the coast and port of Naoetsu. By 1607, Kasugayama was deserted.