Glasgian Oakforest was said princleing, son of Athne Oakforest.
However, it should be noted that in dragon culture a dragon does not care for their own eggs, except in a few rare circumstances. Usually, they give the eggs to a Great Dragon so they can be taught the ways of dragonkind while still in the shell. And dragon eggs can go on 'standby' for a long time when a Great Dragon isn't there teaching them. What Glasgian broke into was most likely a 'cache' of eggs that Lofwyr had set aside, to raise them when he had time, or when mana levels were higher.
And Lofwyr was most certainly not pleased. It is small wonder, then, that Athne quit the Council of Princes about the same time that his son disappeared.