I think I have found another "collateral effect" of the Black Plague: playing with Florence and Aynid emirate campaings at the first ten turns, more or less, the factions of Genoa, Venice and Saint John are fastly destroyed. So having in mind the many rebel sentlements around them and the lack of powerful enemy armies around their cities the only reasonable explanation for this curious case is that the Black Plague kills all their generals leaving the factions without heirs and so inevitably they are destroyed. I understand that this one of the great assets of the game, the bubonic plague strike, however I find also odd how fast dissapear these factions at the begining of the game leaving a huge feeling of emptiness in the campaing. So I think a good and easy solution would be give them more generals at the start of the campaing just as Florence, so the possibilities of dissapear so fast for lack of heirs would reduce considerably.