Here are a few links for you to learn more about Rome's noble families.
An Essential Read
Start with Anthony Majanlahti's marvelous book, The Families Who Made Rome. This book gives you a look behind the names like Colonna, della Rovere, Farnese, Borghese, Barberini and the splendor their wealth and power brought to Rome.
A How To Guide
The Forbes Travel Blog has a terrific article with details on who Chigi, Borgia and Pamphili families are and where you can find sites connected to them.
No royal family is free from scandal and the Doria Pamphilj family is embroiled in a doozy. You can read all the sordid details in the January 2014 issue of Vanity Fair.
Coffee in the Palace
Would you like to stop for coffee and cake in the Palazzo Doria Pamphilj? Read how over on Elizabeth Minchilli's blog.