that Mrs. O'leary's cow was (falsely) accused of starting the Great Chicago Fire.
https://chicago.suntimes.com/2021/10/8/22667265/great-chicago-fire-150th-anniversary-marked-new-museum-exhibit-city-tours
https://chicago.suntimes.com/2021/10/8/22667265/great-chicago-fire-150th-anniversary-marked-new-museum-exhibit-city-tours