Gaia DR2 is set to revolutionize our understanding of the Milky Way's past. I built a catalog of Bulge stars with 6D phase space information and metallicity from existing large-scale Bulge spectroscopic surveys (e.g. ARGOS), which provide line-of-sight velocities and metallicity measurements for 2MASS Red Giant Branch stars, and from Gaia DR2, which provides accurate proper motions. Using this information it was possible to integrate their orbits and thus, gain insight into their origin, opening a small window into the history of formation of the Galactic Bulge/Milky Way.