"Dooku was a Jedi Master who fell to the dark side of the Force and became a Dark Lord of the Sith. Born on the planet Serenno, he was the heir to vast wealth and the noble title of Count. Dooku was taken by the Jedi Order as a child and apprenticed to Thame Cerulian. As a Jedi Knight, he took Qui-Gon Jinn as his first Padawan, and later trained Komari Vosa. Dooku was a respected instructor in the Jedi Temple and one of the most renowned swordsmen in the galaxy. Only Masters Yoda and Mace Windu were considered to have fought on equal terms with him.

Dooku spent nearly seventy years as a Jedi, but a disastrous battle on Galidraan shook his faith in the Order and the Galactic Republic. He fell under the influence of Senator Palpatine of Naboo, and left the Jedi Order. After learning that Senator Palpatine was secretly the Sith Lord Darth Sidious, Dooku turned to the dark side and became a Dark Lord of the Sith himself, replacing the slain Darth Maul as Sidious's new apprentice. His new master bestowed upon him the Sith title of Darth Tyranus.

Reclaiming his birthright as Count of Serenno and his vast fortune, Dooku conspired with Sidious to force the galaxy into a war that would bring the Sith to power. He forged ties between corporations and planets discontented with the Republic, and became the leader of the Separatist movement that coalesced into the Confederacy of Independent Systems. Thousands of star systems flocked to Dooku's banner and seceded from the Galactic Republic.

As the political leader of the Confederacy, Dooku led the organization against the Republic in a conflict that would become known as the Clone Wars, which culminated in a great battle over the Republic capital of Coruscant. In a duel aboard the Separatist flagship Invisible Hand, Jedi Knight Anakin Skywalker defeated Dooku. Skywalker then executed the dismembered and helpless Dooku at the instigation of Supreme Chancellor Palpatine, Dooku's own Sith Master. Ironically enough, Tyranus would quickly be replaced by the very man who had killed him, Anakin Skywalker, who would soon fall to the dark side and be transformed into the fearsome Darth Vader."

--http://starwars.wikia.com/wiki/Dooku

"Anakin Skywalker (nicknamed Ani by his mother) was a legendary Human Jedi Knight who served the Galactic Republic in its final years, and later became the Sith Lord Darth Vader. He was the son of Shmi Skywalker. Later in his life, he became the secret husband of Senator Padmé Amidala of Naboo, and the father of the legendary Jedi Luke Skywalker and Leia Organa Solo. He was also the grandfather of Ben Skywalker, and Jaina, Jacen, and Anakin Solo. He was the great-grandfather of Allana, and an ancestor of Nat, Kol, and Cade Skywalker.

Although he would later become one of the most important people in the galaxy, Skywalker came from humble origins. He spent the first years of his life on Tatooine as a slave along with his mother. In 32 BBY, Skywalker met Jedi Master Qui-Gon Jinn. After obtaining his freedom, Jinn took Skywalker and departed from Tatooine, though they had to leave Shmi Skywalker behind, something her son always resented. Skywalker took part in the Battle of Naboo, destroying the Droid Control Station despite his young age. Soon after, he joined the Jedi Order, becoming a Padawan to Obi-Wan Kenobi. Skywalker was believed to be the Chosen One of Jedi prophecy, one who would bring balance to The Force by destroying the Sith, which was why the Jedi Council chose to bend the Jedi Code and permit his training.

In 22 BBY, Skywalker was reunited with Padmé Amidala, the former queen of Naboo and new Senator of the Chommell Sector. They fell in love and married soon after the Battle of Geonosis, despite the Jedi Order's restrictions of Jedi, which kept them from making their marriage public. In the midst of these events, Skywalker also endured the violent death of his mother.

Skywalker fought in the Clone Wars with his master and became a Jedi Knight in 20 BBY, taking Ahsoka Tano as his own apprentice. Throughout the conflict, Skywalker became an icon to the public, known as the "Hero With No Fear". Despite this, he carried with him a great sense of loss in addition to great anger. His inability to control these traits led to his downfall when, in 19 BBY, he turned to the dark side. Apprenticing to Darth Sidious, better known as his friend Chancellor Palpatine, he became Darth Vader. The Galactic Empire was founded, with Palpatine at the helm as Emperor. The Jedi were exterminated by Order 66, with fewer than a hundred surviving. Two who did live were Grand Master Yoda and Skywalker’s old master, Obi-Wan Kenobi. His children, Luke and Leia, were born at this time, though Vader remained unaware of their existence.

As a master of the dark side, Vader became the scourge of the Jedi, continuing the Great Jedi Purge which would last until 1 BBY. An extension of the Emperor’s will, the Dark Lord was constantly on the move, traveling throughout the galaxy to defeat rebel uprisings or arrest corrupt Imperials. In 0 BBY the Empire’s great superweapon, the first Death Star was destroyed by a young Rebel pilot. Vader became obsessed with discovering the identity of this pilot, and spent the next several years searching. Vader eventually learned that the pilot’s name was Luke Skywalker, and he deduced that the boy was his son, born before the death of Amidala. Vader fought the Rebel Alliance while concocting a plan to turn his son to the dark side.

Palpatine, however, was aware of his plans, and initiated his own plot to make Skywalker his apprentice. In 4 ABY the two sides came together at Endor for one great battle to decide the fate of the galaxy. Skywalker surrendered to the Emperor, and in the throne room of the second Death Star, Palpatine attempted to turn the young Jedi to the dark side by having him duel Vader. Skywalker defeated Vader, but refused to give himself to the darkness, proclaiming himself a Jedi, like his father before him. When Palpatine attempted to kill Luke using Force lightning, Anakin Skywalker emerged from Darth Vader and came to his son’s rescue, saving him and killing Palpatine by throwing him down the main reactor core. Mortally wounded by the Force lightning, he died soon after but he died as a Jedi once more, having redeemed himself by saving his son and fulfilling his destiny by destroying the Sith."

--http://starwars.wikia.com/wiki/Anakin_Skywalker

“Grievous, born as Qymaen jai Sheelal, was the cyborg Supreme Commander of the Droid Army of the Confederacy of Independent Systems for most of the Clone Wars. Grievous was originally a Kaleesh from the planet Kalee, where he lived his early life. The Kaleesh were at war with the Huk in a conflict known as the Huk War. Qymaen jai Sheelal quickly learned the art of war, specializing in a slugthrower rifle. Quickly amassing a great number of Huk kills, he became a demigod among his people. He would then meet the female Kaleesh Ronderu lij Kummar, a master with the sword. The two became very close before her death at the hands of the Huk. Heartbroken, Qymaen jai Sheelal renamed himself Grievous, and then turned all his anger and grief toward the Huk. Aided by his elite, he forced the Huk off Kalee and then swarmed their world, conquering the Huk homeworld. The Huk turned to the Republic for help, and the Kaleesh were forced back to their own world by the Jedi, and left to starve.

Desperate to help his people, Grievous took a job as an enforcer with the InterGalactic Banking Clan. However, after learning that the Huk had attacked Kalee, he headed home to gain vengeance. IBC Chairman San Hill, after consulting with his ally Count Dooku, leader of the Confederacy of Independent Systems, arranged for a bomb to be placed on Grievous' shuttle, Martyr. The Kaleesh was critically damaged, but lived, and then, Hill arranged for the final stage of his plan. Grievous was reconstructed as a cyborg, and was presented to Dooku as a potential weapon to be used in the upcoming war the Count planned.

Grievous was made Supreme Commander, and then, proceeded to wreak havoc on the Republic for three years in the Clone Wars. The general was trained in the art of lightsaber combat by Dooku, who was also a Sith. Grievous was a quick study, and would soon be recognized as one of the most skilled duelists in the galaxy. Aided by his IG-100 MagnaGuards, Grievous killed many Jedi. He led the Confederacy of Independent Systems in the Battle of Hypori, where his existence was made public. In the many battles, such as the Battle of Falleen, Mission to Vassek, and the Battle of Togoria, the Confederacy was victorious thanks to Grievous's leadership. The fearsome cyborg struck fear into the hearts of many with Operation Durge's Lance, a massive strike at the Core.

In 19 BBY, Grievous led the Confederate Navy in the Battle of Coruscant, an attack on the Republic's capital. Grievous killed several Jedi, and took Chancellor Palpatine, leader of the Republic, hostage. However, before his flagship could jump to hyperspace, the Republic Navy arrived. The Chancellor was freed by the Jedi Anakin Skywalker and Obi-Wan Kenobi, who also succeeded in killing Dooku. Grievous fled to the Outer Rim world of Utapau, and attempted to regain control of the war, though the Confederacy had been dealt a great blow with the loss of Dooku. Grievous was killed shortly after arriving in the Battle of Utapau by Obi-Wan Kenobi, and the Confederacy would follow soon after. At some point after Grievous's death, his body was used to create the droid warrior N-K Necrosis, who considered himself the reincarnation of Grievous. However, the droid was killed shortly after his creation by several spacers.”

--http://starwars.wikia.com/wiki/Grievous

“Palpatine, also known as Darth Sidious, was the last Chancellor of the Galactic Republic and the first Emperor of the Galactic Empire. He was a Dark Lord of the Sith who followed the Rule of Two and was considered by many to be the most powerful Sith Lord who ever existed.[5] Palpatine was able to establish his Empire by concocting a complex master plan, which involved starting the Clone Wars, a galaxy-wide conflict that cost billions of sentient lives. Palpatine himself headed both the Galactic Republic and, secretly, the Confederacy of Independent Systems, which allowed him to prolong the conflict in order to gain more executive powers from the Senate.

When his power as Chancellor had reached its dictatorial peak, Palpatine abolished the Republic and replaced it with the first Galactic Empire with himself as leader. With the Imperialization of the galaxy, Emperor Palpatine effectively had total control over its people, and was able to create one of the most powerful military forces the galaxy had ever seen. For nineteen years, Palpatine's rule would go relatively unopposed, until disgruntled former Imperial senators founded the Alliance to Restore the Republic. The Galactic Civil War would last for many years, but in 4 ABY, he was killed by Darth Vader, his former Sith apprentice who redeemed himself as the Chosen One, during the Battle of Endor. However, this did not mean the end of the Empire.

His spirit traveled to Byss, where he inhabited a clone body that he had prepared beforehand. Six years after his first death at Endor, he launched a massive offensive from the Deep Core—one that came close to destroying the New Republic. The victories, however, would not last long, as Palpatine's clones were sabotaged by the former Emperor's Royal Guard, Carnor Jax. Palpatine was killed one final time during his attempt to possess Anakin Solo's body on Onderon, when, after Han Solo shot him, Empatojayos Brand, a former Jedi Knight, bound his soul to Palpatine's, dragging Palpatine deep into the depths of the Force.”

--http://starwars.wikia.com/wiki/Palpatine

"Darth Maul was a Zabrak Sith Lord during the Naboo crisis. The apprentice of Darth Sidious, he was taken at an early age to be trained in the ways of the dark side of the Force. In 33 BBY, Sidious gave Maul his first mission: destroy the criminal organization Black Sun.[3] Maul carried out this task perfectly, dealing the group a grievous blow.

In 32 BBY, the Invasion of Naboo began. Set up by the Dark Lord with the aid of his apprentice, the goal was to get Sidious, as Senator Palpatine, elected Supreme Chancellor of the Republic. After Amidala, queen of the Naboo, escaped, Maul was dispatched to follow her. He found her on Tatooine, where he had a short but intense duel with the Jedi Master Qui-Gon Jinn. Later, Maul was sent to Naboo, where he fought Jinn and his apprentice, Obi-Wan Kenobi. Though he killed the Jedi Master, he underestimated Kenobi’s skill and was slain by the Padawan. Sidious would quickly replace Maul with a more powerful apprentice, the fallen Jedi Master Dooku.

In 0 BBY, Darth Vader encountered and defeated a clone or dopplegänger of Maul created by the Secret Order of the Empire, possibly under orders from Palpatine.

Maul was a master of Juyo, Jar'Kai, and Teräs Käsi, with training in Niman.[4] Maul chose to wield a red-bladed saberstaff in combat."

--http://starwars.wikia.com/wiki/Darth_Maul