Thirumanancheri Udhvaganathar Temple – Legends
Shiva earthly wedding with Parvathi:
Once upon a time, Parvathy wanted to marry Shiva in an earthly marriage with all religious rites on the earth; Brahma, Vishnu and Indira came to earth as acharya in Thiruvaduthurai; while playing Chokkattan (similar to Thaayam), Vishnu won and his sister Parvathy laughed aloud; Lord Shiva was angry and said “Ada pasuve!” and Parvathy was born as a cow on earth; Vishnu became her herder at Therazhundur; Bharatha Maharishi was conducting a yaga and Shiva thought it apt to make Parvathi appear from the yaga kundam.
Thus a divine damsel emerged from the yaga kundam and the sage Bharatha was happy to see her and considered as a holy girl. He was worried about finding a suitable groom for her. The Lord appeared in his dream and assured him that he - Shiva would marry her as she is none other than Parvathi. Shiva also wished that the sage should perform the wedding in a grand manner.
Lord Shiva appeared in the dream of Sage Bharatha that he will enter into wedlock with the celestial who appeared from Sage Kundam. Thus the Sage meticulously looked after the wedding arrangements. The divine wedding took place in Thirumananjeri which was witnessed by celestial beings. Since the Thirumanam (Wedding) took place at Thirumananjeri, this place is called Thirumananjeri.
Lord Shiva converted turtle shaped boy to handsome young man:
The following story also keeps floating around: Two girls promised each other that their son and daughter would marry in future; one got a beautiful girl while the other gave birth to a turtle-shaped boy; former refused the marriage; the latter appealed to the Lord; he converted the turtle to a handsome young man; marriage went off well; so goes the story; hence the belief is that the physical disabilities of the spouse will be either corrected by the Lord or overlooked by the other spouse; hence the marriage obstacles would be removed once you come and pray here.
Lord Shiva gave Mangalya Pichai to Rathi:
Manmadan is believed to have worshipped God Shiva here and the Lord Udhvaganathar graced ‘Mangalya Pichai’ to Rathi Devi and united both Manmathan and Rathi Devi in this kshetram.