“Trypho dealt treacherously with the young king Antiochus. He killed him. He became king in his place. He put on the crown of Asia. He brought great calamity on the land.”
About 142 BCE, Trypho killed Antiochus VI, who would have been only about 7 years old and had ruled from 145 BCE, when he was about 4 years old. Obviously, Trypho had been doing everything, as indicated in the previous chapter. He just wanted to get rid of the young child. He put the crown of Asia on his head. Thus bad things were going to happen to him since obviously he could not claim any royal blood in his family.