4 7 ▁meters . ▁However , ▁most ▁of ▁the ▁square ▁portion ▁of ▁the ▁structure ▁was ▁destroyed ▁during ▁the ▁construction ▁of ▁the ▁Ob ama ▁Line ▁rail road ▁in ▁August ▁ 1 9 1 6 , ▁and ▁the ▁round ▁tum ulus ▁lies ▁isolated ▁in ▁the ▁middle ▁of ▁a ▁rice ▁field . ▁ ▁The ▁round ▁tum ulus ▁has ▁a ▁height ▁of ▁ 6 . 7 ▁meters ▁and ▁was ▁covered ▁in ▁fu ki ishi . ▁F rag ments ▁of ▁h ani wa ▁have ▁been ▁found ▁in ▁the ▁surrounding ▁fields . ▁The ▁tum ulus ▁was ▁also ▁originally ▁surrounded ▁by ▁a ▁ 2 0 - meter ▁wide ▁mo at . ▁ ▁During ▁the ▁rail road ▁construction , ▁the ▁ 5 . 4 6 ▁x ▁ 1 . 3 ▁meter ▁stone ▁bur ial ▁chamber ▁was ▁discovered ▁and ▁numerous ▁bur ial ▁goods ▁were ▁exc av ated . ▁The ▁bur ial ▁chamber ▁had ▁a ▁height ▁of ▁ 1 . 5 ▁meters ▁and ▁was ▁painted ▁red ▁with ▁c inn ab ar . ▁Bron ze ▁mirror s , ▁possibly ▁of ▁Chinese ▁origin , ▁mag at ama ▁and ▁cyl ind rical ▁be ads , ▁gold ▁ear r ings , ▁metal ▁bel t ▁f itt ings , ▁horse ▁orn aments , ▁and ▁weapons ▁including ▁s words , ▁spe ars ▁and ▁fragments ▁of ▁amor ▁were ▁found , ▁all ▁of ▁which ▁are ▁currently ▁in ▁the ▁possession ▁of ▁the ▁Museum ▁of ▁the ▁Imperial ▁Col lections ▁in ▁Tokyo . ▁Jud ging ▁from ▁these ▁arte fact s , ▁the ▁tomb ▁was ▁constructed ▁in ▁the ▁late ▁ 5 th ▁century ▁AD ▁(