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.

On the upper floor of Carousel Boutique, Twilight Sparkle, Princess of Friendship, Sleepovers, and Having Hot Marefriends, presides over her court. But intrigue sneaks into the sleepy setting when Rarity's palette book brings up new questions like "how many words are there for the color blue?"

Rated T for Rainbow calling Twilight a pit sniffer and also general implications of pony boinking.

Twilight has never been a subtle pony, and Starlight has never been a shy one. So when the strength of their friendship leads to some fooling around, it's kind of hard to hide it from their friends. Especially when the bottled-up hormones of two ponies who haven't had much experience with that kind of thing mix together. Despite that, Twilight feels a little annoyed when Starlight always manages to take their friends' interruptions in stride.

Rated T for These Ponies Know What Sex Is (but do it offscreen)

Upon Nightmare Moon's return, the leaders of other nations gather to discuss the situation.

They're not especially happy about it.

Cover art from the gallery of WingFlyte.

Spanish translation, by SPANIARD-KIWI. Russian translation, by Dark Room Collaboration.

Miss Harshwhinny is presented with a dilemma from which there appears to be no ethical escape. Starlight Glimmer is very good at stretching the definition of “ethical.”

A love letter to the writing of Aragon. No creatures were harmed in the writing of this fic.

This story is a sequel to Tantabus Communication Protocol

What started with laziness and a tiny slip-up in arcane intelligence creation has blossomed into its own being. With Luna's blessing, the second Tantabus is free to flit around the dreamscape as it pleases, unburdened by oversight. And what pleases it is making good dreams. Who couldn't be happy by making others happy?

As the Tantabus settles into its life, its horizons keep expanding, forever revealing more of the world and of ponies. There's always new things to learn. New dreams to spice up. New nightmares to beat down. New ponies to help. New ponies to annoy.

Don't tell Luna about that last part.

Cover art by Harwick.

Rumors of a dark cult on the rise are circulating around Equestria. As Princess, Twilight Sparkle has no choice but to investigate this potentially dangerous development.

When she finds that the cult is worshiping her as a divine figure, things become more uncomfortable.

So Twilight falls back to her safe answer: consulting with Celestia for advice.

Unfortunately, Celestia's answers are not what Twilight expected.

Written for Fan of Most Everything's Imposing Sovereigns II contest with the combined prompt of Twilight Sparkle and The New.

Featured 10/24/19-10/30/19!

And with a reading by The Mystery Fluttershy Fan!

Featured in Equestria Daily's 44 Awesome Fanfics to Read for Twilight Day! on 8/6/2020!

Now with a Spanish translation by Spaniard Kiwi!

And reviewed by HapHazred! And also by Loganberry!

And by PresentPerfect with a rating of Recommended!

And with a Chinese translation by jazspid available here!

Princess Twilight Sparkle discovers a centuries-old mystery hidden in the Royal Archives. Her investigation leads through layer after layer of deception and misdirection, setting her hooves on a path that seems to be leading to a mysterious secret. Along the way, she learns that some friendships can be very, very strange.

Book 1 of the Alicorn Adventure series.

AUDIOBOOK by VisualPony
Featured at the Royal Canterlot Library
TV Tropes Page (Courtesy of Sandtalon)
Goodreads Page (Courtesy of Facedeer)
Equestria Daily Page

WARNING: Major spoilers in the comments. Takes place several months after the end of season four. (Not a Da Vinci Code crossover, BTW!)

Do you see a dark tag? No, you don't. Not dark. Well, okay, there are a couple of dark-ish bits, but that's all. Not enough to warrant a tag. Speaking of tags, there really ought to be "Badass Twilight" and "Friendshipping" ones.

Sequels and side-stories (and more) can be found here Offprint and AO3, and a hardbound two-volume set of all that can be ordered from The Ministry of Image.

My editor for the first edition of this story was Gogito, and I can't thank him enough for all the hard work he did. My editor for the revised version was PresentPerfect, and he did a terrific job of getting the story into excellent shape.

A flip of a coin. A twist of fate.

Twilight Sparkle, younger sister of Princess Celestia's personal student, Shining Armor, grew up listening to her brother's bygone dreams of joining the elite of the elite: The Royal Guard.

Now, fresh out of the Academy, this young mare is ready to prove herself equal to the deeds of the great soldiers she read about as a filly. Too bad the princess she ends up protecting isn't Celestia.

This story is a sequel to Queen Chrysalis Reforms (Accidentally)

Tiatarta! The hidden gem of Equestria’s resorts. Sandy beaches, colorful locals, and relative isolation make this the ideal vacation destination. So what kind of friendship problem could this tropical paradise possibly have for Smolder and Ocellus to deal with?

And what the HAY is Queen Chrysalis doing here?! And what did she do to her mane?

Reading Queen Chrysalis Reforms (Accidentally) is recommended for context.