noun
Kofun period; Tumulus period
Historical term for the period of Japanese history from around 250 to 538 CE, characterized by the construction of large keyhole-shaped burial mounds (kofun).
古墳時代には多くの前方後円墳が造られた。
Many keyhole-shaped burial mounds were built during the Kofun period.
古墳時代の遺跡から鉄製の武具が出土した。
Iron weapons were excavated from ruins of the Kofun period.