 As Gao Huan's sons grew older, on one occasion, Gao Huan wanted to test their military abilities by having his general Peng Le (彭樂) launch a mock attack on them.All of Gao Huan's sons, including the older Gao Cheng, were fearful, but Gao Yang reacted calmly and actually captured Peng.As he grew, he continued to be awkward and appearing to be unintelligent, and Gao Cheng, in particular, often looked down on him.