Attalid dynasty
Little is known about Attalus' early life. He was born a Greek, the son of Attalus, and Antiochis. The elder Attalus was the son of a brother (also called Attalus) of both Philetaerus, the founder of the Attalid dynasty, and Eumenes, the father of Eumenes I, Philetaerus' successor; he is mentioned, along with his uncles, as a benefactor of Delphi, won fame as a charioteer, winning at Olympia, and was honored with a monument at Pergamon.