The Temple of Trajan in the rain, Bergama
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Philetarus's nephew and heirs built on their inheritance, and Eumenes II (197-159 BC), King of Pergamum, became the most powerful ruler in Anatolia. He beautified his capital city by building the Altar of Zeus, by constructing numerous buildings in the "middle city" on the slope of the Acropolis, and by expanding and beautifying the Asclepion medical center.
Eumenes II's son Attalus III was not his father's equal. Pergamum's power declined, and on Attalus's death in 129 BC, the Kingdom of Pergamum was willed to Rome and became its Province of Asia (Minor).
Roman Pergamum was still a rich, important city. Some of its most important monuments, such as the Temple of Trajan, date from Roman times.