[JumpCrisscross]

> wonder if Pontifex Maximus is the oldest title still in use

The titles Kaiser and Czar literally derive from Cæsar. Meanwhile, we still maintain consuls in diplomatic relations between countries who often have Senate houses filled with Senators.

[tempodox]

Caesar was the name of Gaius Iulius, not his title. That came later. Pontifex maximus was an honorific title before Caesar's name became one.

[bee_rider]

I guess if Caesar was borrowing from the Pontifex Maximus, that title must pre-date those based on his name.

[toyg]

Technically, the current Pontifex Maximus is (or at least claims to be) the official inheritor of the original title (which is very likely to pre-date the creation of the surname Caesar in the Julia family).

That's not the case for "senator", which turned into a generic word and it's not directly connected to the Senate of the Roman Republic.