His kingdom covered a big part of Western Sicily, as a numismatic distribution study has brought afore.
In 480 BC, Theron, with the support of Gelo, won a great victory outside the walls of Himera against the Carthaginians and their allies.
During the reign of Theron, Acragas along with Syracuse and Selinunte formed a kind of "triumvirate" which dominated Greek Sicily at the time.
Theron died in 473 BC and was briefly succeeded by his son Thrasydaeus, before he was defeated by Gelo's brother and successor, Hiero I.
Pindar dedicates two Olympian odes, 2 & 3, to Theron, both for the same victory in the chariot race at the Olympic Games of 476 B.C.