Swaminatha

As Swaminatha, Karttikeya, the son of Shiva, explained to Shiva the meaning of the sacred syllable AUM (OM).

Swaminatha means Lord of the Lord, means that Karttikeya is above Shiva.

Before that, Brahma, the Creator, did not know about this syllable either.

Read the story here
http://ritsin.com/why-kartikeya-is-called-swaminatha.html/