真土大塚山古墳, Ancient burial mound in Hiratsuka, Japan
The Mado Otsukayama Kofun is a double burial mound combining a rectangular section with a circular rear portion, extending roughly 118 meters in total length. The design merges two distinct architectural forms within a single structure, reflecting the constructional sophistication of this ancient tomb.
This kofun was built during the 4th century and ranks among the earliest burial mounds in the Sagami region of ancient Japan. Its construction occurred as Yamato authority was consolidating control over local communities in the area.
The site reflects connections between local chiefs and the Yamato administration through a triangular-rimmed mirror fragment decorated with animal designs. Such objects suggest how regionally connected communities functioned together during this period.
The original mound no longer remains, but visitors can explore a reconstructed version created at Mado Otsukayama Park in 1996. The park provides comfortable access with pathways that allow you to view the entire site layout.
The burial held bronze mirrors, weapons, jewelry, and pottery, with the principal mirror bearing 24 characters of classical Chinese script. These inscriptions offer a rare window into written communication and exchange with continental powers during this era.
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