Few people claim to know where or how dragonborn came to be. The most common idea is that they somehow descended from the great dragons of the ancient world. Dragonborn used to have a great empire, called Arkhosia, which tried to conquer all the known world, but failed.
Today, dragonborn live in small communities or as part of human towns and cities. Dragonborn have a very strong sense of honor. They often become knights or mercenaries working for the common good. There are different kinds of dragonborn, related to the different kinds of dragons, and their abilities vary. Some can breathe fire, others lightning, still others acid or cold.