About Nagasubramanian Temple
In Kalidasa’s epic poem Kumarasambhava (“The Birth of the War God”; 5th century CE), as in most versions of the story, the gods wished for Skanda to be born in order to destroy the demon Taraka, who had been granted a boon that he could be killed only by a son of Shiva.
They sent Parvati to induce Shiva to marry her. Shiva, however, was lost in meditation and was not attracted to Parvati until he was struck by an arrow from the bow of Kama, the god of love, whom he immediately burned to ashes.
After many years of abstinence, Shiva’s seed was so strong that the gods, fearing the result, sent Agni, the god of fire, to interrupt Shiva’s amorous play with Parvati. Agni received the seed and dropped it into the Ganges, where Skanda was born.
Kartikeya means "of the Krittikas". This epithet is also linked to his birth. After he appears on the banks of the River Ganges, he is seen by the six of the seven brightest stars cluster in the night sky called Krittikas in Hindu texts (called Pleiades in Greek texts).
These six mothers all want to take care of him and nurse baby Kartikeya. Kartikeya ends the argument by growing five more heads to have a total of six heads so he can look at all six mothers, and let them each nurse one. The six Krittikas are Siva, Sambhuti, Priti, Sannati, Anasuya and Ksama.
Source : Wikipedia