I want to know the answer to the following question:
Pergamum was led by whom when they defeated a Seleucid army?
All the background I'm provided with is that "Hierax carved off most of Seleucid Anatolia for himself, but was defeated, along with his Galatian allies, by Attalus I of Pergamon who now also claimed kingship.". Is that enough to answer the question?