This temple is said to have been constructed about 500 years ago.  A bull was roaming in this region (a few villages then) 500 years ago.  The chief crop harvested in the region was ground nuts.  The villagers found that every full moon day their crop of ground nuts vanished mysteriously.  Yhey decided to stay on watch & on a full moon day they witnessed a huge bull golden in colour, eyes shining bright like jewels consume their crop.  But after this incident the bull no longer visited their farm.  Instead, they found a huge idol of a bull appear suddenly on the hill, which was growing at a steady pace.  They had to hit a nail in the form of a soolam (trident) to stop its growth.  

A Nandi appeared in the dream of Kempe Gowda the ruler who laid the foundation for the bangalore city & requested that a temple be built on the hill.  The Nandi is facing North.  Accordingly a temple was built for the Nandi on the hill.  At the foot of the hill is a temple for Dodda Ganapathy (huge Ganesha - 10ft height & 15 ft wide). There is a temple for Lord Siva a little above the Ganesha temple. 

The ground nut fair (Kadalekay Parishe) is celebrated every year on the last Monday of the Kaarthigai month (it mostly falls in Nov).  Farmers believe that they will enjoy a good yield if they offer their prayers to the Nandi on this festival day.  Even those who cannot visit the festival, consume a few ground nuts on that day.