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We report on the discovery of a significant and compact over-density of oldand metal-poor stars in the KiDS survey (data release 4). The discovery isconfirmed by deeper HSC-SSC data revealing the old Main Sequence Turn-Off of astellar system located at a distance from the sun of$D_{\sun}=145^{+14}_{-13}$~kpc in the direction of the Sextans constellation.The system has absolute integrated magnitude ($M_V=-3.9^{+0.4}_{-0.3}$),half-light radius ($r_h=193^{+61}_{-46}$~pc), and ellipticity($e=0.46^{+0.11}_{-0.15}$) typical of Ultra Faint Dwarf galaxies (UFDs). Thecentral surface brightness is near the lower limits of known local dwarfgalaxies of similar integrated luminosity, as expected for stellar systems thatescaped detection until now. The distance of the newly found system suggeststhat it is likely a satellite of our own Milky Way, consequently, wetentatively baptise it Sextans~II (KiDS-UFD-1).

New Kids in Town. Sextans~II: a new stellar system in the outskirts of the Milky Way