Duke Frederick is a usurper, who took the throne from his brother and banished him from the land.
He is moody, greedy, and peremptory. He dislikes people who have a better reputation than he does, and holds the grudge even to their children. He kept his niece Rosalind at court when he took over, latterly because of his daughter Celia’s affection for her cousin, but grows to worry that she plans treason against him, as well as that she overshadows Celia and may try to keep the latter from inheriting. He therefore banishes her. He appropriates all the wealth of the noblemen who flee to the forest to be with his brother, and when he sends Oliver to find Orlando, he takes over the de Boys estates until Oliver returns. He is always accompanied by attending lords whom he can send to carry out his orders. When the number of nobles voluntarily leaving to join the banished Duke grows too high, he raises an army to seek his brother out and kill him, but meets a religious man on the way and is soon converted, relinquishing his government and becoming a hermit in a cave, where he will be joined by Jaques.