柳瀬古墳群

柳瀬古墳群 is a group of burial mounds in 大字柳瀬, 皆野町, 埼玉県, in Japan. Three mounds were located to the northwest of 円福寺. Two have disappeared, leaving only part of 柳瀬1号墳, which was cut down and partly survives as a horizontal stone chamber.

柳瀬1号墳 is a round mound with a diameter of about 10メートル. Its burial chamber is a two-passage type with side walls, known as a 両袖型横穴式石室, measuring 3.6メートル in total length. Finds included 鉄鏃, a fragment of 大刀, 環状鏡板付轡, and fragments of 胡籙.

The mound was excavated in 1991（平成3年）. Based on the form of its stone chamber, its construction is generally dated to the first half or middle of the 7世紀. The excavated finds were designated a 町指定有形文化財 on 1993（平成5年）5月28日.

Kofun are the large burial mounds of ancient Japan, built mainly between the middle of the third century and the early seventh century CE. Alongside the keyhole-shaped form, monuments of this kind also include plain round mounds, double-rectangle mounds, and square mounds.

柳瀬古墳群 is a megalithic mound (tumulus with integral stones) in Japan. A typological estimate: 250 CE to 650 CE. No English Wikipedia article exists for it; the full text below is the Japanese article "柳瀬古墳群", shown in the original language.