Pegasus
Pegasus is a Northern Hemisphere constellation otherwise known as the Winged Horse. It is one of the 48 Greek constellations originally described by the 2nd century astronomer Claudius Ptolemy (Wikipedia). Pegasus remains one of the 88 modern constellations defined by the International Astronomical Union (Wikipedia).
Pegasus (abbrev. = Peg; genitive = Pegasi) covers 1121 square degrees or 2.72% of the celestial sphere making it the 7th largest constellation. It contains 177 stars brighter than apparent magnitude 6.5, the brightest star being Enif.
For more information see the entries for Pegasus at Wikipedia and U. Wisconsin. For a chart of Pegasus, see Peg (IAU).