The Borgias, by Alexandre Dumas, is a newly added free book
at Copia. Relatively new edition from Wildside Press, they are promoting it to read along with the TV show.
CELEBRATED CRIMES Vol I, Part 1: The Borgias. There are dreadful -- perhaps scurrilous -- rumors about the Borgias of renaissance Italy, and here Dumas, author of such classics as The Three Musketeers, in his Celebrated Crimes series, dishes up the dirt in all its ugly glory. This book was not written for children. Dumas has minced no words in describing the violent scenes of a violent time. In some instances facts appear distorted out of their true perspective, and in others the author makes unwarranted charges. The careful, mature reader -- for whom the books are intended -- will recognize and allow for this fact.
This is also in the library here. I haven't looked at it, but the one at Copia is formatted decently (and actually loaded into my library there, properly).