Dr. Andrew Alan Johnson, the senior historian of Civilization 7, accidentally replaced every entry in Civilization 6's Civilopedia with content about Basil II, the Byzantine emperor.
Johnson's responsibilities at Firaxis included writing entries for historical figures and elements in the game, which led to the incident of overwriting the entire Civilopedia with Basil II.
Despite the mishap, the company managed to roll back to a previous version of the Civilopedia, and Johnson continued to work with Firaxis, contributing to the development of Civilization 7's Civilopedia.
Johnson's experience highlighted the differences between working on a team project and academia, showcasing how he navigated challenges and contributed his historical knowledge to the gaming world.