Sophia Dryden and the Culture and History codex entry for Note: Completing the conversation with Dryden will give you the Characters codex entry for Dryden will then mark the location of Soldier's Peak on your world map, and he'll leave to meet you there.
He'll also suggest that you might find some useful relics at the keep, and that the keep might be restored to its former glory. Levi Dryden will then ask you to travel to the old Warden keep at Soldier's Peak, and look for information that might shed some light on Sophia's actions. Supposedly, Sophia conspired to kill the king, and when her plans went awry, she was murdered, and all of the Dryden lands and titles were confiscated.
Dryden will tell you about his great-great-grandmother Sophia, who was the Warden-Commander of Ferelden during the tumultuous reign of King Arland. Lothering, you'll set up a camp in the wilderness, and there you'll meet a man named Levi Dryden.