I swear this has never happened before... Today I was playing Elizabeth on Archipelago/Epic/Prince, on my own private island with SIX gold mines & other financial goodies, so I decided to go for a Philosophy/Oracle slingshot. It paid off in spades -- the next island over held 5 civs, and both my religions spread like madness to ALL of them. Pretty soon I was making so much cash, I haven't gone below 80% science the whole game. Best of all was converting Saladin -- he's the #2 tech leader, and at Friendly status he's been trading his monopoly techs with me the whole game. Then...out of the blue...he DOW's me!!!! His invasion fleet was pathetic -- a mace & 2 catapults against my entire platoon of newly upgraded redcoats (thanks for the experience, mate!) but since I'd neglected to build any frigates (what for? we're all friends here...) so he pillaged quite a bit. Thankfully I was making so much cash, I could afford to buy-rush a full-blown navy in a couple turns. Then I discover steam power, turns out my coal's already connected! But just as my ironclads come online...he asks for peace. I accept, we're back at Friendly, and our trades re-establish just where we left off. What the heck was THAT about??!? I thought Catherine was the only civ who would backstab at Friendly...this is vanilla civ 1.61 btw.