Imperial barons are not the kind of barons that Austen and Dumas wrote about. They are elevated enough to sneer at the most socially prominent person that has ever lived on Earth.
I don't know about sneering at the most socially-prominent person that has ever lived on Earth - at one per roughly 250 million, present-day Earth should have 28 people that would be roughly equivalent to Imperial Barons. Of course, present-day Earth isn't an Imperial world, but a comparison to the present day might give us an idea of what an Imperial Baron is like in more concrete terms.
To put things in present-day terms, an Imperial Baron has some combination of:
- The political power of Vladimir Putin,
- The wealth of Bill Gates,
- The economic power of Mario Draghi,
- The social influence of Oprah Winfrey, or
- The moral authority of the Catholic Pope.
Not every Imperial Baron will have all of these attributes, but all should have at least some of them. For example, while many Barons will be incredibly wealthy, there will be some who are merely well-off; some will have effective political control over a population the size of a present-day nation, while others will prioritize and direct the investment of billions of credits. Some will be so famous, glamorous, and influential that they are followed by paparazz and their choice of clothing will set fashion trends, while others can walk down the street with rarely a second glance.
If you're interested, I compiled my list of the approximately 28 present day "Imperial Barons", from lists compiled by Forbes magazine: the wealthiest people, the most powerful people, and the most influential celebrities. In general, I chose 28 people from those that made the top 10 of each list most often in the last decade or so. The list of "present-day Imperial Barons", in no particular order, is:
Bill Gates (Microsoft)
Vladimir Putin (Russia)
Oprah Winfrey (talk-show host)
Li Ka-shing (Cheung Kong)
Mukesh Ambani (Reliance Industries)
Tiger Woods (athlete)
King Abdullah ben Saud (Saudi Arabia)
Mario Draghi (European Central Bank)
Hu Jintao (China)
Madonna (entertainer)
Ingvar Kamprad (IKEA)
Sam Walton (Wal-Mart)
Barack Obama (USA)
Eike Batista (EBX)
Angela Merkel (Germany)
Warren Buffett (Berkshire Hathaway)
Larry Ellison (Oracle)
Pope Francis (Catholic Church)
Carlos Slim (Telmex, America Movil)
Lakshmi Mittal (Arcelor Mittal)
Ben Bernanke (USA)
Tom Hanks (actor)
Amancio Ortega (Inditex)
Bernard Arnault (LVMH Moet Hennessy)
Steven Spielberg (director)
Prince Al-Waleed (Kingdom Holding Company)
Xi Jinping (China)
David Cameron (UK)