In the very early game, if you haven't triggered the boost to Writing already (so you haven't met another civilisation), and an unknown AI player is defeated it triggers the Eureka for Writing.
My scenario is:
Fractal map type
Epic speed
Playing as Saladin/Arabia
Turn 60
No Eureka for Writing triggered
On an island on my lonesome, no other civilisation or city state, just barbarians. I got the notification that an unknown enemy player had been defeated, this then proceeded to give me the Writing eureka immediately when my turn began. After this Eureka is triggered, I have no new Leader banner in the top right nor did a civilisations welcome screen appear. The only thing that could have triggered this was the notification saying that an unknown player has been defeated.
My scenario is:
Fractal map type
Epic speed
Playing as Saladin/Arabia
Turn 60
No Eureka for Writing triggered
On an island on my lonesome, no other civilisation or city state, just barbarians. I got the notification that an unknown enemy player had been defeated, this then proceeded to give me the Writing eureka immediately when my turn began. After this Eureka is triggered, I have no new Leader banner in the top right nor did a civilisations welcome screen appear. The only thing that could have triggered this was the notification saying that an unknown player has been defeated.