What does Daniel 11:2 mean?

Now I’m going to tell you the truth: Three more kings will rise in Persia, and then a fourth, who will be richer than all of them. When he’s strong with his wealth, he’ll stir up everyone against the kingdom of Greece. Daniel 11:2 - Modern Text Bible

(The messenger predicts the rise of four Persian kings, with the last one provoking a major conflict with Greece.)