Ectar |
The goblinblood wars would probably be disastrous enough, assuming you're looking for sites in Golarion. It took place from 4697-4703. The current year is 4716 on Golarion.
The wars affected the country of Isger worse than any of the others.
I can't say with certainty that any of Isger's cities have thieves' guilds, but it'd be a safe bet.
Ascalaphus |
Most cities of any size would have a criminal underground with one or more gangs being considered the most powerful in it. Whether it's organized enough that "guild" is a good name for it is another matter. But you could also call the mafia in The Godfather a thieves' guild. It fulfills that function: organized crime.