Dragons as a race are one of the oldest created in Mystara. After the axis shift brought about by the Great Rain of Fire, Norwold became one of coldest regions of the planet. Dragons, as a race, have subspecies that adapt to any climate easily, and the high mountains of Norwold were a preferred choice for these intelligent flying lizards. The first dragons to come here were the White. They had moved from the Arctic Regions that had become too hot with the polar shift, and many settled here; others searched further, and finally moved along with frost giants to occupy barren Frosthaven. The White lived in Wyrmsteeth from around 2800 BC in relative peace, little bothered by Antalian tribesmen who were occupied Norwold (indeed, these men proved tasty if frozen)
Problems arose around the year 1900 BC, when a solitary red dragon named Syare stumbled upon the volcanoes of Wyrmsteeth Range and decided to make them his new home. His encounter with the white dragons of the region didn't deter him; he defeated the greatest of them and the others fled, some to the Icereach range, some even to Frosthaven. Then he begin to ravage the Antalian villages and cities, contributing to the fall of that civilisation. Syare forced the Antalian cities to revere him as a god, demanding sacrifices in his name. His rulership was cruel and savage, but it provided the Antalians protection against the horde of King Loark in 1722 BC. Syare ruled undefeated for centuries, finally leaving his realm only to seek Immortality in the Sphere of Matter.
Based on this information it looks like the Wyrmsteeth range would be predominantly inhabited by white dragons circa BC 2300. I suspect there are skirmishes between the dragons and some of their neighbors (mostly the Antalians and the giants of Grondheim).
I'm still looking for other sources of information, but I'd appreciate if anyone who has any could post it here!