The Attalid dynasty reference article from the English Wikipedia on 24-Apr-2004
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Attalid dynasty

The Attalid dynasty was a Greek dynasty that ruled the city of Pergamum after the death of Lysimachus, a general of Alexander the Great. One of Lysimachus' officers, Philetairos, took control of the city in 282 BC. The later Attalids were descended from his father, and they expanded the city into a kingdom. Attalus I proclaimed himself King in the 230s BC, following his victories over the Gauls. The Attalids ruled Pergamum until Attalus III bequeathed the kingdom to the Roman Republic in 133 BC.

Attalid Dynasty of Pergamum