Authors note: hi everypony! So this is my first fanfic, let's see how it goes!

A Forbidden Love

Prologue

It was nighttime in Ponyville. As Princess Luna raised the moon, Twilight Sparkle was up to what she usually was: Studying.

Twilight put a book entitled "Legends of Equestria" back in the book case. She had read that book a million times. In fact, she was pretty sure she had read every book in her library more than once.

"There's got to be a book I haven't read yet" Twilight mumbled to herself. She paced back and forth, scanning the book case for anything she hadn't read yet. Twilight sighed. "Elements of Harmony"? Nope. Read that one a billion times. "Equestrian History"? No. Read that one a zillion times. "Unicorns, Pegasi, and Ponies for Dummies"? Now why did she even have that one?

Then something caught her eye. It was an old faded book with a green cover and golden edges. She pulled it out with her magic.

"'Rulers of Equestria'?" Twilight asked herself, "Why haven't I read this one yet?" She took the book and sat down in a chair. She opened it to page 1.

"Long ago, when Equestria was just beginning, there were two rulers, King Apollo, and Queen Artemis. Apollo ruled during the day, and Artemis ruled during the night. They were fair rulers, and treated everypony fairly. When Apollo and Artemis died, they passed their rule down to their children, Princess Celestia, Princess Luna, and their adopted son ..c..d"

The last word was faded out. "C" and "D" was all Twilight could make out. She began to think. "Wasn't there only two rulers? Who was the third one?" Twilight just had to find out.

"Spike!" she called.

Spike -Twilight's baby dragon companion- wandered into the room.

"What's up Twilight?" he asked.

"I need you to take up a letter to Princess Celestia" Twilight replied.

"Alright then" Spike grabbed a piece of paper and a quill.

"Dear Princess Celestia" Twilight started, "I'm sorry to bother you at this hour, but I desperately need an answer. You see I was reading a book entitled "Rulers of Equestria" And I came to the part about you and Luna. It said you had an adopted brother, but the book was old, so I couldn't make it out. So all I am wondering is who was your brother? Sincerely, Twilight Sparkle"

"So you read a new book?" Spike asked, "That's funny, I thought you read all your books"

"Not this one I haven't" Twilight replied, "Go ahead and send it!"

Spike gave her a puzzled look. He took a deep breath, then shot green flames at the letter. The fire went out the window, and into the night sky.

"Now we just wait for her reply" Twilight said as she sat down on the chair and waited. About five minutes later, Spike's belly rumbled. He then burped out green flames and a letter. Twilight levitated the letter and read it out loud. "Dear Twilight Sparkle. I will be happy to tell you about it. Come to Canterlot Palace tomorrow at 8:00. Your's Truly, Princess Celestia"

"Sounds interesting" Spike said, "So you just need to ask the Princess a question?"

"Yep. It's about her adopted brother. I was reading a book about him, but his name was faded out, so I'm just wondering who he is, that's all"

"Cool. Well I'm going to bed" Spike yawned and headed toward his bed.

"Good night Spike. If I'm not here tomorrow I'm probably at Canterlot" Twilight said