Princess Celestia has been ruling Equestria for thousand's of years. She's seen it all. Literally seen it all. And now she's more than a little bored with the day to day hum-drummery of running her Kingdom. Deciding it's time for a little time off, she opts to take a week long vacation. But not just any vacation spot will do. After all what is there to see or do in a world where she's seen and done it all?

Instead she decides to switch places with a willing human participant. It's the slowest week of the year for the Solar Diarch, and she's absolutely confident her choice for a week long stand in will do just fine. The problem is, she doesn't quite get the right human.

(uuuugh featured?! now I have to put effort into making sure it's tidy and edited and such, curse you fim readers!)

Important notes about the status of this story below

Ever wonder what Equestria's past was like? How did Celestia and Luna come to rule? And what made their rule a time of peace? Well I may have had something to do with that.

Name's Zack. I appeared in Equestria over 3000 years before the show "My Little Pony: Friendship is Magic" takes place. For whatever reason, a few months after my arrival, I was transported to the modern day Ponyville. What happened? Are the Princesses mad at me for disappearing like I did? I only helped establish the greatest country this world has ever seen and then vanished.

That... sounded more innocent in my head. Uh oh...

A/N:
Just to let you know ahead of time, this is a ponified human, 1st person story. If you don't like it, don't bother.
The cover art was made by me, with the exception of the night sky bg (Wertyla).

Edit August 2nd 2016: I want to rewrite this story from the beginning. Read this for more info and tell me what you think.

Edit May 24th 2017: IMPORTANT! I am currently rewriting the entire story and with that, many details and aspects are set to change. As such, it will essentially be an entirely new story, meaning this version of Past, Present, and Future is technically Cancelled. There will be no more chapter updates until I finish the rewrite, meaning that this version will not have a proper ending. If it's requested enough, I may do some kind of Cliffnotes version of how the rest of the story was meant to play out, but for right now just know that if you start reading this version, you will not get an ending. I will post an announcement chapter on this story and Blog on my profile when the writing nears completion and I'm about to start uploading chapters. Thank you for all of your interest in my first public work of fiction. It really means a lot to me.

A human wakes up to find that not only has he been altered in species and gender, but that he has also landed halfway across the world from Equestria, in an unfamiliar land.

This is not that story. Not yet, anyway.

A decade in passing and Kaz has gained a reputation as a member of a well-known group of explorers traveling the world. Not once have they set foot on Equestrian soil, and she was content to keep it that way, for her appearance would bring about unwanted attention from a few certain ponies and one certain baby dragon. So what happens when the rest of the group hears of unbelievable tales of Equestria, and decide that it's time they paid a visit?

An impending disaster, that's what.

Princess Celestia: Goddess of the Sun, ruler of Equestria, beloved Princess of ponies. She is loved by all, and loves all in return. A calm and wise ruler, she sits on the throne in Canterlot, maintaining peace and harmony throughout the land.

What most don't know is that her past is much darker: She was once a commander of legions, a warrior and scientist of unmatched skill. Thousands of monsters and abominations fell to her forces, slain in the name of an old leader, one entombed within his own throne. Free of her old form, free of the powers of Chaos, she was cast into a new realm, in a new form, with a new lease on life.

She is the God Emperor, Eternal Ruler of Equestria and Lord of the Imperium of Man.

Has a TvTropes Page. Please contribute.

Comments contain spoilers. YOU HAVE BEEN WARNED!!!

This story is a sequel to Princess Celestia The Changeling Queen: Stories Behind the Mask

At the Royal Wedding, Chrysalis and the Changelings were revealed to all of Equestria.

But another mask was torn away that day. A mask born for a thousand years. A mask created on one promise. A mask, that has become synonymous, fused, to its bearer.

A mask that when ripped off, causes Twilight, her friends and Luna to question everything they ever knew about the one pony, one very important pony.

At the Royal Wedding, the meaning of the phrase 'Princess Celestia' changes forever.

NOTE: Chrysalis is NOT Celestia!!! That'd be impossible to pull off.

Credits to: Plainoasis for the design of the cover art
Note 2: Original cover art here: https://angelea-phoenix.deviantart.com/art/Contest-entry-Changeling-Celestia-337023552

Pre-read/edited by Zervziel,
Blankscape,
FinalFan,
Courage Fire
Aurora Borealis

Side Stories to this can be found: here.

An audio-reading on youtube up to Chapter 21 is up by StraightToThePoint Studios. I'm aware there are others but this is the nearest complete one: [embed]https://youtu.be/X3eMW673CSY[/embed]

There are also 2 print versions of Princess Celestia:The Changeling Queen. Nonexistent Publications run and Ministry of Image's run.

Contribute to the TV Tropes Page (thanks to Babs_Seed72 for getting it up)

Twilight Sparkle is successfully fulfilling her destiny as the ruler of a kingdom somewhere. Although she has continued to write to Princess Celestia consistently, the latter has distanced herself in recent years. Twilight writes one final letter to her teacher.
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Personally, I prefer the first chapter on its own, but the story does continue in the rest.
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Part 4 in progress!

This story is a sequel to The God Empress of Ponykind

One thousand years ago, Luna, Warmistress of Equestria and sister of Empress Celestia, fell to the powers of Chaos and plunged Equestria into a brutal civil war. The Traitors were defeated, but not before Luna made the ultimate sacrifice and was sealed away in the Immaterium with only the soul of a slain Primarch to keep her company. For a millennium she has been locked away, waiting for a chance to return to her home and her sister.

Now, she has been freed from the Immaterium, and as she takes her first steps in a new Equestria, one ruled by the powers of Harmony, only one question remains:

Does Equestria still need the services of a Warmistress?

Comments may contain spoilers. YOU HAVE BEEN WARNED!

Also Tropes. Please contribute.

Some accidents are small, and some endow you with the power of a godly ruler. On the opposite end of things, you lose your wings along with your ability to move celestial bodies, and you can't tell anypony. Why, because what would they think if the princess became a librarian? It's going to be "fine". Celestia just needs to switch back with Twilight before either of their true identities are revealed. All Twilight has to do is hold down the castle, fight off scheming villains, run the country, and worst of all... deal with all the noble ponies.

Rated teen for shenanigans and some more serious parts. Takes place at the end of lesson zero. Please tear this apart with comments. I like criticism. Comment if you have issues, don't leave me with a mystery thumbs down.