A few days ago I blogged about an open linked dataset about Roman Emperors. I've now more formally published the dataset online at http://www.paregorios.org/resources/roman-emperors/.
I'll be adding more features and data, and improving the dataset description in coming weeks. More information on how to contribute is also forthcoming (and I have a couple of early contributions by others to incorporate as soon as possible!).
I'll blog more here with the label romemplod whenever there's a significant update.