Karalis is the proper city choice in Sardinia; it was the most significant city on the island at the time. The only other hypothetical I would see would be Tharros, midway up the western coast (the city was established by Nuraghi, then conquered by the Phoenicians and later the Romans).
I visited this summer:
(Tower is from a later Spanish period.)
I don't understand the placement of the port at the northeast of the island, however. Karalis was a significant port in its own right.
http://en.wikipedia.org/wiki/Cagliari#Early_history
http://www.isolasarda.com/nora-storia_e.htm
I certainly don't think Sardinia warrants 2 cities. I'm not even sure Corsica warrants its own city.
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