I just ran into this trade situation on turn 17.
I saved the game to think about it and play later.
I found an early relic with Poland on turn 4.
That gives me 4g, 2c, 6f and 8 tourism per turn from the palace.
So I've already received 13x those amounts which is significant this early.
Now I meet Rome who will give me a Large Trade Deal for the Grapevine Cross...
This will get me at least 1 settler which I can settle on another continent.
That should help lock up a Classical Golden Age with decent Faith Output for Monumentality.
I can use the remaining gold for another settler, builder or something else.
Is it worth giving up the relic for a city?
Would 2 cities be more valuable for the relic trade?
Perhaps it is better to keep the relic and push for a faster CV?
I know the AI can get all upset if you have a relic.
I guess the point was that trade deals are still abundant but I find this situation a dilemma.
The land here is pretty abundant and OP, IMO.