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Outflows from super-massive black holes (SMBHs) play an important role in theco-evolution of themselves, their host galaxies, and the larger scaleenvironments. Such outflows are often characterized by emission and absorptionlines in various bands and in a wide velocity range blueshifted from thesystematic redshift of the host quasar. In this paper, we report a strong broadline region (BLR) outflow from the z~4.7 quasar BR 1202-0725 based on thehigh-resolution optical spectrum taken with the Magellan Inamori KyoceraEchelle (MIKE) spectrograph installed on the 6.5m Magellan/Clay telescope,obtained from the `Probing the He II re-Ionization ERa via Absorbing C IVHistorical Yield' (HIERACHY) project. This rest-frame ultraviolet (UV) spectrumis characterized by a few significantly blueshifted broad emission lines fromhigh ions; the most significant one is the C IV line at a velocity of -6500km/s relative to the H{\alpha} emission line, which is among the highestvelocity BLR outflows in observed quasars at z > 4. The measured properties ofUV emission lines from different ions, except for O I and Ly{\alpha}, alsofollow a clear trend that higher ions tend to be broader and outflow at higheraverage velocities. There are multiple C IV and Si IV absorbing componentsidentified on the blue wings of the corresponding emission lines, which may beproduced by either the outflow or the intervening absorbers.

Probing the He II re-Ionization ERa via Absorbing C IV Historical Yield (HIERACHY) I: A Strong Outflow from a z~4.7 Quasar