How did the Dragonlord get to Alefgard?
The Dragon Queen died before her son, the Dragonlord, was hatched. She asked Erdrick to protect her egg after she died. She died soon after and strangely Erdrick just left the egg there. Once the Archfiend was destroyed and the portal to the overworld was sealed (where the egg was), it was obvious no one could protect the Dragon Queen’s precious egg. Luckily a group of powerful Alefgardian magicians took the Dragon Queen’s egg after Erdrick left it alone and replaced it with a forgery. They returned to Alefgard where they protected the egg in secret.