Spectroscopic survey of the low mass population in the star-forming region Lagoon nebula

Using data from the GAIA-ESO spectroscopic survey, we describe the determination of spectroscopic and stellar parameters of circa 400 low-mass members of the Lagoon Nebula. Based on this analysis, we discuss the luminosity/age spread in the H-R diagram, lithium evolution and place in our findings in context of recent theoretical and observational works. We also compare our results with time-series and near-mid infrared data.