Miróbriga ("Mirobriga Celticorum") is an ancient Roman town located near the village and civil parish of Santiago do Cacém, in the municipality of the same name in the south-west of Portugal. Archeology revealed a that the town occupied the site of an ancient Iron Age settlement that existed since the 9th century B.C.
Can we infer the following?
Miróbriga is the site of the first Iron Age settlement

 (I). Yes; (II). It's impossible to say; (III). No;
The answer is:
(II).