Throughout most of its history, ancient Greece was comprised of city-states which had limited power beyond their boundary. On the small island of Rhodes were three of these, Ialysos, Kamiros, and Lindos. In 408 BC, the cities united to form one territory, with a unified capital, Rhodes. The city thrived commercially and had strong economic ties with their main ally, Ptolemy I Soter Egypt. In 305 BC, the Antigonids of Macedonia who were also rivals of the Ptolemies, besieged Rhodes in an attempt to break the Rhodo-Egyptian alliance. They could never penetrate the city. When a peace agreement was reached in 304 BC, the Antagonids lifted the siege, leaving a wealth of military equipment behind.