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It seems I overdid it with Godrick's development. The worst part is that I taught him a spell that grants immunity to all subsequent spells when cast. After defeating the first army, he had 160 Angels, 800 Archers, 2,000 Armored Guards, and many Paladins. The Paladins were immediately defeated by the Angels under my control. And after the control was lifted, these Angels quickly destroyed everything I had left.
I'll try playing again, changing my army-building strategy. Right now, I don't have enough money to recruit troops from two castles. Even the 20,000 gold I received from the Sphinx didn't help. A support hero with Isabella's starting army sailed to him. At the same time, I looted all the ships.
I won't be making Dragons. They are too expensive, and they die very quickly. This will help me recruit more other units. I might use Isabella's training abilities.
If that doesn't help, I'll have to re-level Godrick without that terrible ability. As it turned out, Godrick is a stronger mage than Markel. He practically left Markel without Dark Magic. The Phoenix also doesn't last long. After all, Godrick's skills are almost equal to those of a 34th-level Knight. And he has enough mana for everything.