Timeline
5 113 BBY : Birth of Tenebrae on Medriaas (1460 Before Treaty of Coruscant) .
5 100 BBY : Tenebrae becomes Lord Vitiate, thus named by Marka Ragnos.
4 999 BBY : Vitiate's Annihilation Ritual of Medriaas, he becomes Immortal and Emperor of the Siths. 8000 Sith Lords are killed in this ritual, not counting all the inhabitants.
4 980 BBY : The Sith take refuge on Dromund Kaas, Vitiate swear to bring back the Empire.
-Divination of Vitiate.
-Creation of the Dark Council.
-Creation of the Hands, Eyes and Voice of the Emperor.
3 978 BBY : Manipulation of Mandalore the Ultimate by the Siths.
3 976 BBY : Beginning of the Mandalorian wars.
3 960 BBY : End of the Mandalorian wars by Revan and Malak.
-Revan and Malak become Siths, corrupted by Vitiate.
3 958 BBY : Beginning of the Jedi Civil War by Revan and Malak.
3 956 BBY : End of the Jedi Civil War.
-Revan frees himself, kills Malak and destroys the stellar forge to prevent Vitiate from winning.
-Revan is captured by Vitiate who put him in a stasis room to be interrogated and tortured.
3 853 BBY : Vorak Thual is put in stasis by Vitiate with his original body.
? BBY : Vitiate makes a transfer of essence into Valkorion's body on Zakel in the past, so he begins building the Eternal Empire because he notices that Sith dogma is limited. He sets up the eternal fleet.
3,681 BBY : Beginning of the Great Galactic War, return of the Sith Empire.
3,671 BBY : Battle of Bothawui lost because Vitiate is focused on the Eternal Empire, and meets Senya Tirall.
3 669 BBY : Birth of Arcann and Thexan.
3,659 BBY : Birth of Vaylin.
3,653 BBY : Looting of Coruscant and signing of the Treaty of Coruscant. (0 ATC)
3,642 BBY : Resumption of the war between the Republic and the Empire.
3 641 BBY : Vitiate is defeated. Battle of Ilum.
3,638 BBY : Resurrection of Vitiate, death of Revan.
3,638 BBY : Destruction of Ziost by Vitiate.
3 637 BBY : Attack of the Core Worlds by the Eternal Empire, death of Thexan by Arcann.
3 637 BBY : "Death" of Valkorion by Darth Nox who is trapped in carbonite.
3,632 BBY : Liberation of Nox, creation of the Alliance.
3,630 BBY : Nox becomes the emperor of Zakel after vanquishing Valkorion in his mind.
64 BBY (1956): Birth of James Potter / Sirius Black / Remus Lupin / Severus Snape / Lily Evans (4 yrs before real time-line)
47 BBY (1974): Birth of Harry Potter, James and Lily had sex after the victory of Gryffindor's team at quidditch. Lily gave birth to Harry just after school terms in 31/07.
41 BBY : Birth of Anakin Skywalker / Julien Potter / 1980 / Harry is 6 years old.
36 BBY : Harry follows Valkorion. He is 11 years old.
(3621 ATC) 32 BBY : Palpatine becomes Supreme Chancellor, Anakin joins the Jedi Order. / 1989 / Harry is 15 years old.
(3623 ATC) 30 BBY: 1991 / Harry is 17, he passes his test at the Black Temple. He absorbs the memory of Vitiate present in the holocron, retrieves his body and wakes Vorak Thual enslaved. Harry comes on Earth for the Philosopher's Stone.