Shani Deva is a great devotee of Lord Shiva. The Adhidevata of Shani is Prajapati Brahma, and the Prtyadhidevata is Yama. According to religious texts, Shani was born to Surya's wife Chaya. During the pregnancy period of Chaya Devi, she was continuously engrossed in the devotion of Lord Shiva. More @Wikipedia
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