Love this kind of history. Have bookmarked for a leisurely read.

You might enjoy the works of turn of last century Welsh writer Arthur Machen, who explored how ancient Celtic culture survived and filtered through Roman (and Romanized i.e. modern) Britain. In his works the rational is ultimately no match for the daemonic mystical.

Fiction: “The Great God Pan” and “The Hill of Dreams”

Autobiography: “Far Off Things” and “Things Far and Near”

Public domain and available from Project Guttenberg and other online sources.