Mythological Significance & History

The original temple was built during the Chola period (roughly 12th century), and it was later repaired / expanded by the Nayak rulers in the 16th century.
The name Alangudi comes from a legend: during the Samudra‑Manthan (the churning of the ocean), a lethal poison emerged. The devas (gods) were afflicted and sought help from Shiva, who consumed the poison to save them. Thus the place came to be known as Apatsahayesvarar (the one who helps in crisis).
Another legend holds that Guru (Jupiter) was blessed here by Lord Shiva, giving this place its association with the planet and its astrological powers.