Ō-yoroi (Heian Samurai Armor)

Timeline

1. 900–1000Heian-kyō and surrounding estates · Heian periodAs the warrior class rose in the 10th century, the ō-yoroi, centered on the horizontally laced dō-maru and the standing-crest kabuto with fukigaeshi, suited mounted yabusame archery tactics and replaced earlier hanging armor as the mainstream.
2. 1050–1060Samurai estates in Kantō and Kansai · JapanIn the mid-11th century, samurai families such as the Minamoto and Taira were widely equipped with ō-yoroi; kabuto crests like maedate and sujikabuto marked status, and ō-yoroi production was the specialized work of armorers (katchūshi), becoming a symbol of samurai honor.
3. 1180–1185Battlefields across Japan · JapanDuring the Genpei War the ō-yoroi remained mainstream in mounted archery and foot combat; afterward, practical needs drove evolution toward lighter haramaki and tōsei-gusoku, while the ō-yoroi shifted to ceremonial and votive uses.