Where did Railag go?

Today, I played through the Tribes of the East campaign and didn't see Raileigh anywhere, even though at the end of the Hammers of Fate campaign, it was said that he would join the Orcs. As a result, Isabel appeared at the end, but Raileigh was nowhere to be found. He also won't appear in Heroes 6 because the events there take place 400 years before Heroes 5. Does anyone know where the developers put Raileigh?

Sorry if this topic already exists.