He's spreading the glory of Sparta to anyone and everyone, I don't believe it has anything to do with cities that are "owned" by gods.
Besides, it's not "if he attacked rhodes"....he definitely did, someone linked the video for you.
http://homepage.mac.com/cparada/GML/Rhodes.html
Seems Helius is the patron of Rhodes, which would leave me to believe that it was "owned" by a god anyway.
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