As per the folk faith Marich had hidden himself due to the fear of Shri Ram. Shri Ram had traced him with the divine help of Lord Shiva. Therefore Shri Ram had founded the Siddheshwar temple at this place.
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Valmiki Ramayana 3/44/1 to 3/44/22, Manas 3/26/6 to 3/27/1.