|Title||Maester at Whitewalls|
|Book||The Mystery Knight (appears)|
Lothar was stooped and old. He had long hair and his face was lined and aged with a large nose.
After Duncan lost his armor and horse to Ser Uthor Underleaf, Duncan's squire, Prince Aegon Targaryen, went to Lothar and showed him the dragon ring that had been given to him by his father, Prince Maekar Targaryen, hoping to enlist Lothar's help in sending a raven for help. However, Lothar delivered the Targaryen prince to Lord Ambrose Butterwell upon seeing the ring.