Lenn Teraan, formally known as Lord Lenn Teraan, Guardian of the Eternal Flame, was a Human male aristocrat belonging to House Teraan and the brother of Cedonia Teraan.
During the period of the Great Galactic War fought between the Galactic Republic and the Sith Empire, Lenn and Cedonia were affiliated with House Teraan until its destruction during a conflict with House Baliss, which forced them to seek refuge with House Organa. House Baliss seized control of their family's ancestral land during this period.
In 3643 BBY, Lenn and Cedonia Teraan hired a smuggler to sneak into their former property to retrieve information from their home library. This data was needed to unlock an old Gonk droid that held the key to restoring their family's status. Once unlocked, the droid revealed that many other families owed debts to House Teraan. Subsequently, the siblings left to meet with the Royal Council to validate the data, but only after providing the smuggler with the blueprint for a powerful anti-radiation shield that their associate Risha had previously arranged.
Later, the Teraans requested assistance from the Voidhound again when House Baliss discovered the smuggler's intrusion. As a result, they dispatched Xin Baliss to challenge Lenn to a mortal duel. House Organa declined to get involved because they viewed the Teraans' initial actions as a threat to the ongoing peace negotiations. Fortunately for the Teraans, the smuggler agreed to fight Xin and succeeded in defeating the seemingly invincible duelist, who had previously won all his duels with a single shot. Despite being impressed by the smuggler's abilities, the Teraans decided to leave Alderaan before House Baliss could launch further attacks on their lives.