In Chapter 16, the party learned that Dr. Gulliver Vatticus had been a physician in Rozenport in the 4680’s, with an unsavory reputation.
In Chapter 17, the party learned that Rozenport was the home of Ulver Zandalus before he was transferred to Briarstone Asylum in 4685 (33 years before the start of the adventure).
In Chapter 27, the party learned that Aggra Loomis had been a serial killer operating in Rozenport in the vicinity of the 4660s to 80s.
First Reference: Chapter 8
Other Notable References: Chapter 16, Chapter 17, Chapter 27