Very well then!
Revan came to life in 3994 BBY, somewhere in the outer rim. He joined the jedi temple on coruscant at a very young age and followed the teachings of 3 different jedi masters.
He was a Jedi Knight that took part in the war facing the republic and the mandalorians in 3960 BBY, against the council's will. The council had decided that the jedi order would not interfere in this conflict, and Revan was a vocal and charismatic critic of the Order's inactivity in the ongoing war. Followed by a few followers called the Revanchist (including his apprentice, Malak, and a young padawan devoted to him named Meetra Surik), Revan took off to fight the Mandalorians. He quickly joined the Republic forces and was appointed Supreme Commander.
At the end of the war, during the final battle that took place on Malakor V, Revan challlenged Mandalore The Ultimate, the leader of the Mandalorians, into a duel to the death. Revan won, took Mandalore's mask, the ultimate symbol of the mandalorian warrior cast, to and hide on Rekkiad, an Icy world, in the hope that no one would ever find it. Without a leader, the mandalorians were scattered and powerless.
But Revan knew there was something behind the Mandalorians attack against the republic... Mandalore would never have attacked the republic without a good reason. Mandalorians told him that Mandalore had traveled in the other rim, and came back with his desire of conquest. Revan took off for the other Rim with Malak, his apprentice, in the hope to find answers.
At the term of their journey, they landed on a planet named Dromund Kaas. Little did they knew that this was the capital of the Sith Empire, home of the sith council and the Emperor himself. When they figured out, it became clear to them that it was a priority to take down the emperor before alerting the republic about what was going on on Dromund Kaas.
But it was a trap. The Emperor knew they were on his planet and was waiting for them. The force was so strong with him that he managed to twist their minds, turning them into puppets of his will and sending them off against the republic, just like he had for Mandalore.
He became Darth Revan, and followed by Darth Malak, they started their crusade against the republic. Nobody know how, but Revan and Malak managed to free their minds of the Emperor's will and started their invasion like if it was their idea in the first place. They discovered a very ancient Rakata artifact called The Starforge, a space station. This station was automated and so powerful that it was able to create a gigantic army all by itself (Soldiers, ships, destroyers, etc). From this point, Revan and Malak launched an attack against the republic.
But Malak had no intention to stay Revan's apprentice forever. During a battle, while Revan's flagship was being attacked by jedis, groupe of jedis led by Bastila Shan, Malak turned the cannons of his ship and fired in direction of Revan's flagship, knocking him out, unconscious. The jedi took the chance and captured Revan, fleing the battle in their capital ship.
A part of the Jedi Council had the desire to bring Revan before justice to make him face his crimes, while the other part was still attached to the idea that Revan might be a powerful ally. They finally decided to wipe his memories using the force and started all over again. Revan became a soldier of the republic, without any idea of who he was or what had happened to him. Meanwhile, Malak was still spreading chaos throughout the Republic.
When Malak heard of what had happened to his master, he decided that it was time to finish him off! It took time for Revan to get back his memory, but when he finally did, with the Help of Bastila and Malak, he started to remember what had happened to him, elements by elements. After that, Malak managed to turn Bastila to the dark side and turn her against Revan! What saved her from it was her special link with Revan. In fact, they were both deeply in love with each other. After Freeing Bastila from the Dark Side, Revan faced Malak in an ultimate fight on the bridge of the Star Forge. Without surprise, Revan won the Fight, and freed the Galaxy from Malak's Tyranny!
Back on Coruscant, Revan married Bastila! Because of their marriage, and because of his past, the jedi council decided not to accept Revan back into the order. They even banished Bastila from it, since such passion was forbidden.
Revan was concerned. He was unable to remember what had happened to him! Why he had join the Dark Side, where did he go with Malak after the Mandalorian War, what did they found? He was having nightmares almost every night about his past, so he decided to leave Coruscant with T3-M4, his loyal astromech droid, and Canderous Ordo, is mandalorian friend, to seek answers. He left his pregnant wife on Coruscant with the promess to return.
Canderous wanted to find Mandalore's mask in order to unify the Mandalorians again. His goal was not war, but unity! With his visions, Revan managed to remember where he had hidden the mask! The entire Mandalore clan was already on Rekkiad, an icy world where Revan had hidden the mask! With his help, Canderous found the mask, took it, and became Mandalore the Preserver.
Finding the mask helped Revan to remember more details about what had happened to him after that. He took off, alone with T3, to find more answers!
I'll keep this updated! I'm tired and I've got some work to do haha!