Originally Posted by
Vejjiegirl
The Sahagin summoned Leviathan because the people of Limsa denied them the space to build spawning grounds on the coasts. The Garleans had nothing to do with it. In fact many of the beast tribes were adamant on summoning their primals before the Garleans even stepped foot on Eorzean Soil.
Another example is the peace treaty between Limsa Lominsa and the Kobolds. This treaty was broken after Limsa Lominsa moved in over conflicts over their ore. I'm assuming some kobolds were killed as well since the dialogue that titan gives and the cutscene between Merwyb and Y'shtola imply it.