Lord Shiva took birth in the house of sage Dadhichi as Piplaad. But the sage left his house even before Piplaad was born. When Piplaad grew up he came to know that his father left the house due to bad planetary position of Shani. So, Piplaad cursed Shani and caused the planet to fall from His celestial abode. Later he forgave Shani on a condition that the planet would never trouble anyone before 16 years of age. Hence worshipping the Piplaad form of Lord Shiva helps to get rid of Shani dosha.