Present day...
POV Luna
"Where did you find this journal Luna?" asked Celestia. "We found it in the library, hidden in a secret niche." Celestia started flipping through it before presenting it to me to look at. "I've never seen a language like have you?" Indeed it was just a mess of runes to me. "Nay, we have not, sister." Celestia started pacing back and forth as she was coming to a decision. "I'll send this to Twilight, perhaps she'll find someway to translate it."
Later in Ponyville...
POV Spike
"Hey Spike can you find me 'The Elements of Harmony Guidebook'?"
"Yeah, why?" I asked.
"I want to see if the elements have any physical effects on their bearers." she replied.
I was about to go get it for Twilight when I felt my stomach clench and in a burst of magical fire a burped up a letter and a worn out book.
"What do we have here?" I watched as Twilight picked up the book and scroll with her magic and start to read the letter.
Dear Princess Twilight, I have sent you an aged journal that Luna had discovered. It is written in a strange and unknown language that neither me or Luna know. I believe that you may be able to translate it. Princess Celestia.
It sounded pretty strange, I mean a language that somepony as old as Celestia and Luna don't know, and yet she thought that Twilight could manage to translate it. Twilight decided that we would head to the Castle of the Two Sisters and look through the library there. On the way we were joined by the rest of our friends, who agreed to help us in our search.
25 minutes later...
We were searching through book after book and had yet to find anything like the language we were looking for. I glanced at the table and noticed that the old book was sitting there. I hadn't got to see what this language looked like, so I picked it up and started to look at it.
Journal of the Dragon Prince
This is my first day writing in this. I decided that it would be a great way to keep track of my feelings and give me someone to vent to without actually talking to anyone or anypony. Anyway, today I met King Solar and Queen Dusk who apparently were good friends of my parents and allowed us to live in Equestria. I also got to meet their daughter, Celestia. She seemed pretty nice and agreed with me in saying that she didn't enjoy being at royal events all the time. I believe I just made my first pony friend.
So who ever this had belonged to was a friend of Celestia's which I found quite interesting.
OK so right now Celestia is getting ready to raise the sun. King Solar believed that she was ready to do so and earn her cutie mark. She getting ready so I'm going to stop for now, at least until she finishes raising the sun.
OK Celestia has finished and sure enough she had earned her cutie mark, which was a sun. She was pretty happy to have earned her cutie mark, now King Solar just needed to teach her everything about the day and some tips & tricks to raising the sun. I returned back home since I didn't need to know these sun tips.
"Spike why are you reading that book?" I looked up the journal to look at Twilight before I replied.
"Well I wanted to see what this language looked like and I guess that I somehow was able to understand it." There was a long pause as nopony said anything.
"OK, then lets head to Canterlot and let Celestia and Luna know about this." she replied.
On the train ride to Canterlot, I continued to read the journal and as I read it I started learning that this desert kingdom was filled with dragons that were friends with ponies. But from what I was reading I started learn that all of this had happened thousands of years ago. 'I wonder if this dragon prince is still alive?' Any further thoughts were halted as we pulled into the station. It was time to see if Celestia and Luna could tell us anything about this dragon prince.