The Vishnuism and Sivaism of the south go back to the early centuries of our era, but the chronology is difficult.
"Hinduism and Buddhism, Vol I. (of 3)" by Charles Eliot
Yet as an idea, as a philosophy, Sivaism possesses truth and force.
"Hinduism And Buddhism, Volume II. (of 3)" by Charles Eliot
Sivaism, without any hostility to Vishnuism or Buddhism, was the dominant creed.
"Hinduism and Buddhism, An Historical Sketch, Vol. 3 (of 3)" by Charles Eliot
Much of Sivaism has probably the same origin.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7" by Various