It might be possible, for example, to work backwards from the known realia of Visigothic Spain.
Source: wiktionary
Realia
/ɹeɪˈɑːlɪə/
Synonyms for "realia"
Ranked by relevance and common usage.
Sample sentences
2 total sentences available.
"We acquire entire collections of materials for research purposes," explains Saundra Taylor, curator of manuscripts at the Lilly Library at Indiana University in Bloomington. "That inevitably includes something that's not books or manuscripts."
Source: wiktionary