Markab
Markab, is a white star on the wing of the Winged Horse. Alpha Pegasi (α Pegasi, abbreviated Alpha Peg, α Peg), formally named Markab, is the third-brightest star in the constellation of Pegasus and one of the four stars in the asterism known as the Great Square of Pegasus
Markab is one of the four bright stars that form the Great Square of Pegasus, an asterism that takes up much of the eastern portion of Pegasus constellation. The other three stars that mark the vertices of the Great Square are Algenib (Gamma Pegasi), Scheat (Beta Pegasi), and Alpheratz (Alpha Andromedae). The asterism outlines the body of the celestial winged horse and is very useful in finding a number of other stars and deep sky objects.[1]