A research/exploration megacorp/institute. In the Dark Ages of Solsys the organization was a local defence force but it reinvented itself and became prominent during the First Federation and remained active through Second Federation times. The Lagrange Defenders were especially influential in early colonial efforts in the Inner Sphere (New Mars is just one example) and in the field of xenopaleontology. They are especially well known for having discovered the first evidence of interplanetary-level xenosophont technology (in 1460) and are most famous of all for their discovery of the Tunh wormhole. Though the organization no longer exists under that name in the Inner or Middle Spheres, there are persons and groups claiming to represent it still active along the Periphery.