I’ve always been fascinated by the Etruscans. They were a mystery already by Claudius’ day. The language having been long dead in contrast to Phoenician (which some then contemproary scholars had a vague understanding of).
Part of a speech by Claudius survives on a bronze tablet found in Lyon in the 16th century. He goes off on a tangent talking about the Etruscan traditions concerning the figure the Romans called Servius Tullius (6th of the traditional 7 kings of Rome).