Pieria (pĪērˈēə) [key], region of ancient Macedonia, W of the Thermaic Gulf (the modern Gulf of Thessaloníki). It included Mt. Pierus, an early seat of the worship of Orpheus and the Muses, and Mt. Olympus. The Muses were sometimes called the Pierides, a name given also to nine daughters of the legendary King Pierus of Macedonia. They contested with the Muses in song, were defeated, and were changed into magpies.
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