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The discovery of quasars few hundred megayears after the Big Bang representsa major challenge to our understanding of black holes and galaxy formation andevolution. Their luminosity is produced by extreme gas accretion onto blackholes, which already reached masses of 10$^9$ M$_\odot$ by z ~ 6.Simultaneously, their host galaxies form hundreds of stars per year, using upgas in the process. To understand which environments are able to sustain therapid formation of these extreme sources we started a VLT/MUSE effort aimed atcharacterizing the surroundings of a sample of 5.7 < z < 6.6 quasars dubbed:the Reionization Epoch QUasar InvEstigation with MUSE (REQUIEM) survey. We herepresent results of our searches for extended Ly-Alpha halos around the first 31targets observed as part of this program. Reaching 5-sigma surface brightnesslimits of 0.1-1.1 x 10$^{-17}$ erg/s/cm$^2$/arcsec$^2$ over a 1 arcsec$^2$aperture, we were able to unveil the presence of 12 Ly-Alpha nebulae, 8 ofwhich are newly discovered. The detected nebulae show a variety of emissionproperties and morphologies with luminosities ranging from 8 x 10$^{42}$ to 2 x10$^{44}$ erg/s, FWHMs between 300 and 1700 km/s, sizes < 30 pkpc, andredshifts consistent with those of the quasar host galaxies. As the firststatistical and homogeneous investigation of the circum-galactic medium ofmassive galaxies at the end of the reionization epoch, the REQUIEM surveyenables the study of the evolution of the cool gas surrounding quasars in thefirst 3 Gyr of the Universe. A comparison with the extended Ly-Alpha emissionobserved around bright (M$_{1450}$ < -25 mag) quasars at intermediate redshiftindicates little variations on the properties of the cool gas from z ~ 6 to z ~3 followed by a decline in the average surface brightness down to z ~ 2.

The REQUIEM Survey I: A Search for Extended Ly-Alpha Nebular Emission Around 31 z>5.7 Quasars