What Roman military hero do you admire most?

[Gaius Colletti]

Didn't he also have his son Crispus executed, possibly because of a plot on Fausta's part (Zosimus again)?

He had Crispus executed because Fausta's accused him of making advances at her allegedly (she was his stepmother), and Constantine flipped out and gave orders to have Crispus executed, by the time Constantine's mother (being Crispus' grandmother) put some reason into Constantine's head, it was too late and the orders to execute Crispus were already carried out.

It was at this time when he was certain that Fausta had fooled him, that he had her executed. He also had his brother in law executed after he resigned him of duty, as well as his nephew.

Constantine did a lot of great things for the Empire, but he felt that since he was ruling in favor for God, that he could do no wrong