Taga Castle, 8th century fortress ruins in Tagajō, Japan
Taga Castle is an eighth-century fortress ruin on a plateau near the Pacific coast in Tagajō, roughly 10 kilometers northeast of Sendai. Stone foundations and earthen embankments form the grounds, which span several hectares and are crossed by walking paths.
The fortress was established in 724 under Ōno no Azumabito and served as the administrative center of Mutsu Province as well as a military base for controlling northern territories. Over several centuries the site remained an important outpost before being abandoned during the medieval period.
The name Taga Castle alternates in the sources with Taga no Ki (多賀柵), the form first recorded in the Shoku Nihongi in 737. The site's best-known object is the Taga Castle Stele, a two-metre stone near the south gate known as Tsubo-no-hi; its inscription, carved by Fujiwara no Asakari in 762, records the fortress's construction under Ōno no Azumabito in 724. The stele was designated a National Treasure in 2024.
The ruins are reachable on foot from Kokufu-Tagajō Station, with blue directional signs marking the route through the archaeological grounds. Access is possible year-round, though earthen paths can become slippery after rain.
The defensive walls once formed a perimeter of 3.4 kilometers and consisted of roughly 5-meter-high earthen ramparts topped with wooden fortifications. Today the ground structure still reveals where towers and gate buildings stood.
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