I don't see skull
Is that 3 legs?
Like it stood on a table?
Some sort of stand?
Doll house table?
Maby a sort of stand for stamping, or jewelry making?
How do you know its a Roman relic< im not questioning you just asking
Brady
Its a Lead left over from metal working. When they poured the lead in the mould & filled it up via the 3 holes that fed to either 3 different objects or 1 large one, it then brimmed to the top & dried (making it look a little skull like). So you have metal working nearby on the Site.