What the Excavation Revealed

The mansion occupied an entire machi block of roughly 1.4 hectares. The buildings divided clearly into two zones: a northern cluster of utilitarian structures (storage rooms, kitchens, and servant workshops) and a more stately southern group forming the core of aristocratic life. In the south stood a principal hall facing a rear building, with flanking wing rooms on either side. Several of these structures were linked by covered corridors so that the residents could move from building to building without stepping outdoors — a hallmark feature scholars recognize as approaching the mature shinden-zukuri style.↗↗

Notably, however, no formal garden pond — an essential element of the classic shinden-zukuri estate — was confirmed at this site. The Ukyō mansions of the 9th century, researchers conclude, represent the eve of that architectural form: they possessed the building layout but not yet the integrated garden and water features. The full shinden-zukuri style, with its pond-centered gardens, only matured in the 10th century, and its stage shifted to the thriving Sakyō (Left Capital) district where the Fujiwara regent houses consolidated power.↗↗

The domestic side of the estate was equally revealing. Multiple timber-lined wells were uncovered, some preserved enough to show their internal frames. Archaeologists identified zones the report describes as hare (formal, ceremonial spaces where guests were received) and ke (everyday working spaces for cooking, storage, and household management). Among the artifacts were Haji pottery bowls, Sue-ware vessels, green-glazed ceramics, Chinese celadon and white porcelain, copper coins datable to the 840s–870s, iron tools, wooden combs, and stone ornaments — a rich portrait of mid-Heian material culture at home.↗

Visiting the Site and Exhibition

The archaeological remains themselves lie below grade within the grounds of Kyoto Research Park, a mixed-use technology and business campus. The location is identified on maps as a historic landmark. The real centerpiece for visitors is the Heian Aristocrats' Life and Culture Exhibition Room in the park's East Sector building, where a large one-fortieth scale model measuring 3.5 meters by 2.2 meters faithfully reconstructs the mansion's layout. Excavated objects — ceramics, coins, and the base of an original timber column — are displayed alongside it. Admission is free.↗↗

The exhibition room is open weekdays from 10:00 to 17:00, closed on weekends and national holidays. The easiest access is a five-minute walk from JR Saga-Arashiyama Line Tanbaguchi Station.↗

Why It Matters

For anyone fascinated by Heian court culture — the world of seasonal poetry competitions, elegant leisure, and the rituals that defined aristocratic life — this site is where the physical stage of that world first took shape in Kyoto. The discovery of a complete noble household from the mid-9th century, before the literary sources fully describe the setting, provides something books alone cannot: the ground plan of the halls where aristocrats gathered, the corridor routes they walked, the wells they drew water from, and the everyday kitchens that supported their ceremonial lives. It is one of the most important single-residence excavations ever conducted in Heian-kyō and a quiet treasure for those who know where to look.↗↗