While the historical background of this tumulus is still unclear, there is a possibility that the bomb was used as a castle, in the same manner as Nagura Kitaike located about 300m south-west of Tsukiyama Tumulus, (Nagura Kitaike is the castle site of Banzai clan, the powerful samurai clan of Hiratanosho Manor) and Babasaki site located south to the tumulus, which is also presumed as a castle related construction.
歴史的には不明であるが、南西約300ｍ離れた名倉北池（平田荘の有力武士である万歳氏の城跡：付近に池田遺跡がある。）と同様に、城として使用された可能性があり、すぐ南方にも城と関係を推測させる馬場崎と言う場所がある。