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''Gusuku'' are Okinawan castles or fortresses and sacred sites. Known especially for their long, winding stone walls, the height of ''gusuku'' construction was in the 14th century, a time of conflict on [[Okinawa Island]]. Five are included alongside a handful of other Okinawan sites in a single group [[World Heritage Site]] as "Gusuku Sites and Related Properties of the [[Kingdom of Ryukyu]]."<ref name=unesco>"[http://whc.unesco.org/en/list/972/ Gusuku Sites and Related Properties of the Kingdom of Ryukyu]." UNESCO: World Heritage Convention. Accessed 15 May 2011.</ref> Though some three hundred or so ''gusuku'' sites are known throughout the [[Ryukyu Islands]] chain,<ref>"Gusuku in the Islands" gallery label, Okinawa Prefectural Musuem.[https://www.flickr.com/photos/toranosuke/30407278555/in/photostream/]</ref> the vast majority are today in ruins; only [[Shuri castle]] has been reconstructed.

''Gusuku'' are Okinawan castles or fortresses and sacred sites. Known especially for their long, winding stone walls, the height of ''gusuku'' construction was in the 14th century, a time of conflict on [[Okinawa Island]]. Five are included alongside a handful of other Okinawan sites in a single group [[World Heritage Site]] as "Gusuku Sites and Related Properties of the [[Kingdom of Ryukyu]]."<ref name=unesco>"[http://whc.unesco.org/en/list/972/ Gusuku Sites and Related Properties of the Kingdom of Ryukyu]." UNESCO: World Heritage Convention. Accessed 15 May 2011.</ref> Though some three hundred or so ''gusuku'' sites are known throughout the [[Ryukyu Islands]] chain,<ref>"Gusuku in the Islands" gallery label, Okinawa Prefectural Musuem.[https://www.flickr.com/photos/toranosuke/30407278555/in/photostream/]</ref> the vast majority are today in ruins; only [[Shuri castle]] has been reconstructed.

The [[Gusuku period]] of Okinawan history takes its name from these fortresses, which were at their peak at that time.

The [[Gusuku period]] of Okinawan history takes its name from these fortresses, which were at their peak at that time.

Settlements incorporating embedded-pillar buildings, [[Okinawan tombs|tombs]], and fields, became quite numerous across the islands in the 12th-13th centuries. ''Gusuku'' construction then developed further in the 13th-14th centuries as a few powerful ''anji'' emerged, seeking to expand their power, and fueling a period of armed conflict. They built new buildings with pillars on stone foundations, and encircled the settlements in high stone walls and waterless moats, transforming them into fortresses.<ref>Gallery labels, Okinawa Prefectural Museum.[https://www.flickr.com/photos/toranosuke/29775636243/sizes/l]</ref> Most of the largest and most famous Ryukyuan ''gusuku'' fortresses, and those with the most impressive stone walls, date to this period.

Settlements incorporating embedded-pillar buildings, [[Okinawan tombs|tombs]], and fields, became quite numerous across the islands in the 12th-13th centuries. ''Gusuku'' construction then developed further in the 13th-14th centuries as a few powerful ''anji'' emerged, seeking to expand their power, and fueling a period of armed conflict. They built new buildings with pillars on stone foundations, and encircled the settlements in high stone walls and waterless moats, transforming them into fortresses.<ref>Gallery labels, Okinawa Prefectural Museum.[https://www.flickr.com/photos/toranosuke/29775636243/sizes/l]</ref> Most of the largest and most famous Ryukyuan ''gusuku'' fortresses, and those with the most impressive stone walls, date to this period.

The island was divided in for most of the 14th century into [[Sanzan period|three kingdoms]], known as [[Hokuzan]], [[Chuzan|Chûzan]], and [[Nanzan]], which were then united circa [[1419]]-[[1429]] by [[Sho Hashi|Shô Hashi]], king of Chûzan, who in so doing, united the island and established the Kingdom of Ryûkyû. ''Gusuku'' had already begun to become - as castles around the world do - not merely military fortifications, but residences for the powerful, and symbols of power, prestige, and wealth. Shô Hashi established Shuri castle as his palace, and the center of political & administrative affairs for the kingdom, while other ''gusuku'', such as [[Nakijin gusuku]], the largest on the island, had already been used by the lords (kings) of Hokuzan as a sort of palace as well.

Like castles around the world, ''gusuku'' were not merely military fortifications, but residences for the powerful, and symbols of power, prestige, and wealth. Shô Hashi established Shuri castle as his palace, and the center of political & administrative affairs for the kingdom, while other ''gusuku'', such as [[Nakijin gusuku]], the largest on the island, had already been used by the lords (kings) of Hokuzan as a sort of palace as well.

Many ''gusuku'' continued to be occupied and used by ''anji'' under the Ryûkyû Kingdom, who served as local administrators. Many others, presumably, fell into disuse, however, in the 17th-19th centuries, and all suffered extensive damage in the 1945 battle of Okinawa. Some have since been named World Heritage Sites, and many more have become public parks or the like.

Many ''gusuku'' continued to be occupied and used by ''anji'' under the Ryûkyû Kingdom, who served as local administrators. Many others, presumably, fell into disuse, however, in the 17th-19th centuries, and all suffered extensive damage in the 1945 battle of Okinawa. Some have since been named World Heritage Sites, and many more have become public parks or the like.