His fascination with history compelled him to delve centuries past.ancient archives, _____uncovering forgotten tales ____centuries past.

His fascination with history compelled him to delve centuries past.ancient archives, _uncovering forgotten tales centuries past.

beneath; within

into; from

throughout; towards

amidst; about

"His fascination with history compelled him to delve into ancient archives, from uncovering forgotten tales from centuries past."

Into is used to suggest moving deeply into something (like archives).
From indicates the source or origin, in this case, the forgotten tales from centuries past.