Owain aep Clenwog was Ardal aep Dahy's ambassador to Mahakam. In 1267, when he heard that Queen Meve of Lyria and Rivia was passing through the enclave, he deceived the dwarves by making them cause an avalanche in order to clean the mountians, not knowing that Meve's army was marching on the road below. Although the queen remained unhurt, several of her soldiers died in the snow.
If Meve attacks Owain: Meve didn't leave the ambassador unpunished, thus she broke the emissary's immunity and killed Owain and all his escort.
If Meve doesn't attack Owain: Since Meve needed Elder-in-Chief Brouver Hoog trust, she decided to not attack Owain, leaving him unpunished.