With gilding up to its eaves, elaborate lacquerwork and mother-of-pearl inlay, the Konjiki-dō was at the cutting edge of Heian-era artistry when it was created in 1124 – and it still impresses today. Beneath the three altars are the mummified remains of three generations of the Ōshu Fujiwara family. Given Hiraizumi's unlucky history, it seems a miracle that the Konjiki-dō has survived. To avoid tempting fate, the pavilion is now behind glass inside a fireproof enclosure.
The adjacent treasury (讃衡蔵; Sankōzō) contains the coffins and funeral finery of the Fujiwara clan – scrolls, swords and images transferred here from long-vanished halls and temples.