Anyone who has studied the timeline in the appendices of the Lord of the Ring knows what life is all about: writing fantasy timelines. Right?
You can easily get lost in your creation when you write a fantasy timeline. I know I have, so you should make some basic design choices and nail down some fantasy staples, before your focus on the core of your story: the needs of your characters. The following is a generalization of (mostly) European history and fantasy tropes, and may serve as a blueprint for a fictional history.