Some diplomacy has been going on here, clearly 

Spoiler 19 envoys required for suzerain... :
Well, that happens. I was a suzerain of it with 6 envoys, then Teddy declared war on me, all my 5 allies jumped in, and somehow Tamar went slightly over the top trying to counter Teddy's diplomacy
(But they do save envoys and deploy them to take enemy CS out of war, an interesting strategy...) Speaking of Teddy... He was unhappy that I captured a city-state on our continent in the Ancient Era for about 5000 years... Finally when I had battleship armadas he decided to attack... Then after I pillaged the crap out of him (it was something like 4 GPs worth of gold and faith, them corsary barbairs are good!), he suddenly forgets those ancient grievances and becomes a friend...
