Pandavas’ mother Kunti begot them by chanting the Mantra taught by Sage Dhurvasa, a sage who remains immortal even after the second Pralaya,the withdrawal of the Universe, when only Vishnu remains in yoga Nidra.

Sages Markandeya and Dhurvasa remain with him, along with the Saptharishis.

Image Credit.http://templesoftamilnadu.co.in/olympus-digital-camera-8-2/

 

 

Image credit for 2 and 3.

https://hiramprakash.wordpress.com/2015/05/13/thirunallur/

Kunti Had three sons,

Yudhistir, son of Yama, God of Death/Righteousness and Dharma, representing ether,

Bhima, through Vayu, air,

Arujuna through Indra, chief of Devas and god of thunder,rain and lightening,

Matri, the other wife of Pandu, who was given the mantra by Kunti, gave birth to Nakula and Sahadeva through  Ashinikumaras, Devas for Medicine,which is an attribute of Earth, Prithvi.

And Kunti begot Karna before she was married through SUN, Surya, representing fire.

Though this was due to the Power of Mantras getting progeny through direct contact with the five elements, Earth, Water, Fire, Air and Ether, it is not natural and as such is a Sin.

This sin is to be atoned.

On the advice of Sage Narada, Kunti had her sins expiated by worshiping Shiva as Kalyana sundara  at Thirunallur, Thanjavur District, Tamil Nadu.

This lies near Papanasam, enroute from Kumbakonam to Myiladuthurai.

Airport.Thiruchirapalli.

Railway Station.Kumbakonam , Myiladuthurai.

One can catch a bus from either of these towns and get don on the main road and has to travel aout 4 Km.

Local conveyance is scarce.

Personal conveyance is preferable.

Moolavar.kalyana Sundaresarar.

Consort.

Urchavar	:	Kalyanasundareswarar
	Amman / Thayar	:	Kalyanasundari
	Thala Virutcham	:	Vilwa
	Theertham	:	Sabthasakaram
	Agamam / Pooja	:	–
	Old year	:	1000-2000 years old
	Historical Name	:	thirunallur
	City	:	Nallur
	District	:	Thanjavur
	State	:	Tamil Nadu

 

	The temple is open from 7.30 a.m. to 12.00 a.m and 5.30 p.m. to 8.00 p.m.

 

	Sri Kalyana Sundareswarar (Panchavarneswarar) Temple, Tirunallur-614 208, Valangaiman Taluk, Kumbakonam, Thanjavur district.

 

Those born in Magam star pray here to realize their wishes.  Also pregnant women pray here by conducting the bangle ceremony for safe delivery.

According to scriptures, the devotee will derive equal benefits by having a bath in the tank of this temple as having one in the Mahamagam tank in Kumbakonam.  Kundhidevi mother of Pandavas incurred dosha as she had children with  Panchaboodhas.  She approached Maharshi Naradha for a solution.  Naradha suggested that she should bathe in seven oceans for relief.  When Kundhi Devi pleaded her inability to do so as women, Narada suggested that she should worship Lord Kalyana Sundareswarar and he would offer the next suggestion then.  Before Kundhi finished her prayers here, Narada brought the waters of the seven oceans (Saptha Sagaram) to the tank in the temple.  Kundhi belonging to Magam Star bathed in the tank and was relieved of her dosha.  Thus the Nallur temple tank derived equal importance as that of the Kumbakonam Mahamagam tank offering high benefits to the devotees, according to scriptures.
Lord Kalayana Sundareswarar appears in five different colours each day – copper, pink, golden, emerald green and one that could not be named or recognized.  Hence, is praised as Panchavarneswarar – God of five colours.
Lord granted His Feet Darshan (Pada darshan) to Saint Tirunavukkarasar.  Hence, the tradition of Sadari blessing as in Vaishnavite temple came into practice here too. 

Mother Ashtabuja Makali – Mother with eight hands blesses the devotees in the temple.  Somaskanda Murthy of the temple is a replica of the one in Tiruvarur temple.  During Masi Magam day in February-March, He comes in procession in the prakara.  During the procession, though devotees fan Him for the heat, we may observe pearls of sweat on the idol.
It is said that the Vilwa tree of the temple is the first one on earth, hence called Aadhi Tree.  It would be a unique luck of those praying the Lord with the leaves of this tree.
Lord Gana Natha blesses here in the form of a Balipeeta at the entrance of West Tower.  It is only in this temple and in Kasi-now Varanasi, Gana Natha graces in this form.  A special puja is celebrated annually for Gana Natha.  People of this place and those around offer the one time milk they get from their cows for abishek.  But devotees cannot see this puja.  Amarneedhi Nayanar one among the celebrated 63 Nayanmars was granted salvation by Lord in this temple.

During the divine Shiva-Parvathi wedding in Mount Kailash, the place went down due to the heavy weight of the presence of all the beings to have this darshan.  To balance the level of the earth, Lord Shiva sent Sage Agasthya to South.  The sage had to sacrifice his wish of witnessing the wedding.  Lord assured him that He would grant the wedding darshan to him in this holy place.  Enjoying the divine darshan here, Sage Agasthya installed a Linga right of the Sundaralingam for his worship.  That Linga is behind the presiding Linga..

Citation and reference.

http://temple.dinamalar.com/en/new_en.php?id=367