Dragonborn Isles. There was a legend that the Dragonborn were descendants of dragons in the past. However, no record of their origin really surfaced after millennia of searching and researching. However, they do possess an inheritance such as the way to summon dragons from other dimensions. And theses dragons would help them reach the pinnacle of the world by its incredible power.
After all, dragons, like the dragonborn in Alleucanth were the world's strongest creatures! This was a pride that cannot be taken away from them easily! That's why, no matter where they are, when they appear, others would not easily offend them for fear of their wrath.
"Hmph! You are called Dragonborn? What are you, offspring of us mighty Dragons?!"