Yes, we have two main sources from the Early Roman Occupation era:
Strabo, Geographies (64-21 BCE):
The Romans put a stop both to these customs and to the ones connected
with sacrifice and divination, as they were in conflict with our own
ways: for example, they would strike a man who had been consecrated
for sacrifice in the back with a sword, and ...
In Proclusean hierarchy heroes were higher ranking than mortals, purified souls, daimons, lower than angels, archangels and Deities. They received worship and commemoration alike to the Gods. In fact they were - for example - Herculean mysteries and Herculean temples, stemming from the Eleusis rites (Heracles was a succesful initiate of these mystery schools)...