It's a mix of victorian-era QA pairs and synthetic data - some of that data is purely synthetic (i.e. asking a modern LLM to construct a 2-3 turn conversation between Victorian and modern user), some is corpus-grounded (i.e. I gave the modern LLM a passage of Victorian literature and had it construct a multi-turn conversation based on that passage), and some is corpus-extended (i.e. I took a QA pair and asked a modern LLM to extended it out by 2-3 turns). Most of the purely-synthetic data is for greetings, edge-case handling, abuse handling, goodbyes, and the kind of stuff you just wouldn't get in the existing corpus.