Hizen Provincial Capital Ruins, Archaeological site in Saga, Japan.

Hizen Provincial Capital Ruins is an archaeological site with preserved foundations of administrative buildings and residential areas from ancient times. The remains show an organized settlement layout with different functional zones.

Excavated pottery and roof tiles date the founding of the provincial office to the first half of the 8th century. The compound was rebuilt in two main phases, early and late, but the size and arrangement of its buildings stayed essentially the same. The main hall and corridor were later converted from post-hole construction to stone foundations, though no foundation stones survive.

The site is now laid out as a history park, with the south gate and part of the earthen tsukiji wall rebuilt on the original lines. The name recalls the Kokufu, the provincial seat; the Heian-era dictionary Wamyosho gives it as "Ogi no Kokufu", and the exact site of the earlier Nara-period seat is still debated.

When visiting, you will find information boards and excavated remains that explain the layout of ancient structures. It is helpful to allow time to explore and understand the different areas of the site.

The complex measures 104.5 m north-south by 77.2 m east-west, and its central axis is tilted about 7 degrees west. The main hall had a four-sided veranda, giving 9 bays by 4, while the front and rear halls were 7 bays by 2. The south gate was rebuilt twice, and some of its foundation stones remain in place.