The royal court of Canterlot welcomes its newest member with open forelegs: the human philosopher Voltaire, from Earth.

On Earth, Voltaire is known as the greatest enemy of tyranny in the history of literature, and a legend in his own mind.

On Equestria, the court betting pool is giving him a week before the Princess banishes him to the Moon.

Note: This story doesn't have sequels per se, but there are a couple of short follow-ups set in the present day ("Parade Coverage" and "Secret Histories"), and a prequel of sorts in "At the Inn of the Prancing Pony".

TV Tropes page.

"I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man."
-Thomas Jefferson

Three hundred years ago, Equestria tried to assimilate Earth.
They failed. They fled, rather than face justice.
We moved on. We conquered the stars, we made a civilization that spans across the infinite void. We built true harmony between species.
We thought we'd seen the last of Celestia, but as a desperate mobile colony on the fringes of known space came to discover, we were wrong.

It is time to finish what was started by our forefathers.

Based on TCB: Not Alone, by Starman Ghost.

EDIT: Following Starman Ghost's deleting of Not Alone, I've replaced the above link with one leading to a PDF file uploaded to mediafire.

EDIT (14/04/2014): The character of Evening Star was originally created by Starman Ghost. I am using her without his permission.

Princess Celestia is losing control of her political power. The system is slowly crumbling due to the inverse relationship between harmony and "freedom". With the invitation of television sets, the internet, and instant coffee machines, "freedom" becomes the preferred theme of the Celestian empire as opposed to harmony.

With no other options (or perhaps due to a stroke of genius), Princess Celestia brings a self proclaimed expert on "freedom" to Equestria along with his entire family to create a new show with familiar roots: The Coltbert Report.

How will his family handle the new Equestrian life? Will Stephen Coltbert be able to return harmony to the land with his mixture of satire and wit? Only time and hundreds of episodes will tell.

Join Stephen Coltbert as he provides the conservative viewpoint on Equestria so that you don't have to.

Cover art by Stinkehund.

Featured on Equestria Daily: 1/16/2013