Questions are the stuff from which writers are made. For those of us who write historical fiction, the major question that guides our work is "What if?" Those two little words can conjure up virtual worlds, alternate realities, and a tantalizing glimpse into what might have been.
The nice parts about writing historical fiction are you'll never run out of plots, settings, intriguing characters, or fateful decisions. For example:
Want to make Charlemagne a twin who has taken his brother's place? No problem.
Think Cleopatra needs to have had a fear of spiders? Why not?
Convinced that Marc Antony really wanted to get it on with Caesar's wife? Righto.
Wondering if the Borgias were actually victims of lead poisoning instead of evil from the getgo? have at it.
The point is that history is just the starting point. The rest is up to you. What's your spin on history? Is it leading to a published work? Time will tell.