It's a shame that Philip of Macedon can't get his own billing. He was a legend in his own right before his son overshadowed him.
Haha, you wouldn't need to know much about history to know that sons would not exist without their fathers ;)
I guess for a headline-writer, though, "Alexander the Great" has near-universal recognition, while "Philip of Macedon" doesn't have enough to assume that a general audience will have their eye caught by the headline. So it ends up with this slightly dumbed-down phrasing.