Ivan's Tower was a prison located in the Talonguard Castle. It was named after King Ivan Griffin, the first ruler of the modern Holy Griffin Empire. During the events of Heroes V: Hammers of Fate, the usurper Biara, disguised as the legitimate Queen Isabel, locked Godric in Ivan's Tower so she could manipulate his daughter into her service. For a short while, Freyda was constrained to follow the impostor against her wishes, but chose to rebel against the regime when Laszlo foolishly started a war against Grimheim.