Aya Castle is a castle located in Aya, Miyazaki Prefecture, Japan. Aya was built from around 1331 to about 1334. Its name derives from the man who oversaw the construction of the castle, who referred to himself only as "Aya" (his real name was Koshiro Yoshito). His family ruled over the castle until the Muromachi period, when the head of the Itō clan took over Aya Castle. The Shimazu clan seized the castle following their victory over the Itō in 1577. The castle was then given to Niiro Hisatoki, one of the retainers for the Shimazu Clan. Toyotomi Hideyoshi conquered the castle for a short period ten years later. In 1615, however, the castle was destroyed due to a shogun era decree that every domain could have only one castle.

The present keep (tenshu) was rebuilt in 1985 using original plans and houses a museum displaying samurai armor, weapons and historical documents.

More Info: en.m.wikipedia.org