Formal:
* Historian: This is the most direct and formal synonym for chronicler.
* Annalist: This specifically refers to someone who records events in a year-by-year fashion.
* Historiographer: This emphasizes the scholarly nature of the chronicler's work.
* Recorder: This is a general term for someone who documents events.
Less Formal:
* Storyteller: This emphasizes the narrative aspect of the chronicler's work.
* Accountant: This focuses on the detailed and factual nature of the chronicler's record.
* Journalists: This applies when the chronicler is focused on current events.
Figurative:
* Watcher: This emphasizes the chronicler's observation of events.
* Witness: This highlights the chronicler's firsthand experience of events.
The best word to use will depend on the specific context of your writing.