Basinus I, king of the Thüringians - Reign

My guest is that his reign before the Lombard's, and Franks took over. It seems that sometime in the 5th Century was his time line. Here's link to some info on Bisinus.

en.wikipedia.org/wiki/Bisinus

I hope this might give you lead to your question.

The first source cited in the profile is Medieval Lands https://fmg.ac/Projects/MedLands/THURINGIA.htm#Basinus.

Cawley no longer cites Basinus as father to Baderic, Herminafred, and Berthar/Berthachar, on the grounds that the chronology is out of line.

Wikipedia is currently giving a "consensus version", with discussion of various alternatives.

This far back, facts, legends and myths get inextricably entangled.