Landgrave is a noble title in the Lyran Commonwealth. It was revived by Katherine Marsden Steiner. The title is usually given to people who own a great deal of land on a world or own a large industrial concern. The title is awarded by either the Archon or the Duke that controls a world.
- House Steiner (The Lyran Commonwealth), p. 89
- Handbook: House Steiner, p. 99