By coincidence the two books I'm currently reading are both about emperors. The first is The emperor of scent, which was given to me by James Halliday on my recent Aussie trip. We got chatting and he thought I'd enjoy it. He's right - it's a good read.
The second is a review copy of Elin McCoy's The emperor of wine, subtitled The remarkable story of the rise and reign of Robert Parker. This is out next month in the UK. I'll let you know how I get on with it and what I think.