さかのぼるそうだ
遡るそうだ
sakanoboru sōda

Godan Verb (ru)
Evidential Auxiliary

Expresses hearsay ("I heard that...") of さかのぼる

1. I hear that it dates back to...; I hear that it traces back to...; I hear that it goes back to...

Hearsay Evidence
Usually Written in Kana