I know Lord Shiva is one of the Trinity. A lot of temples dedicated to him especially in South India. The god is worshipped by millions. But I came across a link which is about a different proposition. But below are the words which bewildered me.
Shiva, a Puranic god, started small as Rudra (meaning savage or wild) in the Rig Veda. A minor god, with only two and a half hymns dedicated to him
How much truth is there in this article? Was Shiva really a minor god during Vedic periods ? If the article is false I would like to know that when was the Trinity first mentioned in Vedas ?