I'm designing a game that involves identifying historical events, and I'm looking for an online source that I can use to generate a set of event cards.
For my prototype, I'm using a copy of the game Chronology, but to publish a print-and-play version, I'd need to find or create my own set of cards. If I could find an online source with a permissive licence, that might not be too much work. Other games like Chronology that could be used for prototyping would also be helpful.