How kartikeya was born..?

• According to the Skanda Purana, Shiva's first wife Sati angrily immolated herself after she felt insulted by her father Daksha when he didn't invite Lord Shiva for a Yagna Ceremony and further insulted Him. 

• An irate Lord Shiva then destroyed the Yagna with the help of ganas. An ascetic Shiva was married with great difficulty the first time around and a second marriage was nearly impossible. 

• Taking advantage of the fact the demons - Tarakasur and Surapadma thought the boon of being killed only by Lord Shiva's son would make him invincible. 

• Kama, the God of Love, awakens Lord Shiva from His penance to remarry Him to Goddess Parvati. Angered by the interruption in his meditation, Lord Shiva burns Kama to ashes with His third eye though He does fall in love with Goddess Parvati. 

• Lord Shiva's hands His fiery seed fire to Agni who can handle it till the radiance becomes Shiva's offspring.

•  Unable to bear the heat, Agni gives the radiance to Ganga who deposits it in a lake in a forest Sara Vana where Kartikeya is born (giving him the name Saravana) with six faces - eesanam, sathpurusham, vamadevam, agoram, sathyojatham and adhomugam, and hence the name Shanmuga or Shadanan. Kartikeya was cared for by six women symbolising Pleiades (Kritika in Sanskrit) and thus got the name Kartikeya.