Planewalker propose an idea of what Sigil is after faction's war.
My idea is to devellop some backgrounds for other epochs of this city.
I have some suggestions like :
-The rise of the wizard Shekelor, whose power was nearly so big to destroy the Lady.
-The Great Shake Up (600 years ago, when the Lady decided that only 15 factions will continue to exist). In the period that followed it, the Indep were the most numerous, but the Lady reduced their number by a strange desease.
-The rise and fall of the Expantionnists (and their leader Timlin, owner of the sword lightbringer)
My own, very basic timeline of Sigil.
- Even before the great upheaval, the fall of Asokar, Lord of Portals and the razing of his temple.
- The Great Upheaval.
- The Blood war spills into a portion of Sigil that will become known as the Slags. Originally in the Clerk's Ward, the Hive Ward eventually grows so that the Slags form a border between the Clerk's Ward and the Hive.
- Rise of Shekelor the Lich.
- Rise and fall of the Expansionists.
- Fall of the Communals.
(everthing since the great upheaval could be in any order, really)
- The rise of Sects, like the Ring-Givers and others too small to be called factions.
- The Faction War.
[In my own campaign, Post-faction war, the factions have returned and re-established themselves in Sigil, though some, like the Mercykillers, are more fragmented than before. I liked how in the original PS, the factions were each in charge of their their own aspects of Sigilan society. So the factions returned, and polite folks who don't want to get into an argument in the streets never mention the faction war, but the factions no longer have a lock on the Sigilan Advisory Council. Powerful individuals, Sects, and various coalitions of guilds and temples would have more influence in Sigil than before, but the Harmonium still acts as the Cage's defacto police force, the Fated collect the taxes, and the Xaositects make every day livlier than the last in the Hive.]