In my current game, I noticed some time back that the Ottoman Empire had been fully conquered (I can no longer meet with Suleman for diplomacy). This past turn, the notification came up that Oda had declared war on "!", with the icon indicating that he had just declared war on the Ottomans.
I have no idea how or why this happened, but it's strange that the AI will declare war on civs that no longer exist.
I have no idea how or why this happened, but it's strange that the AI will declare war on civs that no longer exist.