Uruthirajenma Kannar

Uruthirajenma Kannar (Tamil: உருத்திர சன்மகண்ணர்) was a poet of the Sangam period to whom verse 31 of the Tiruvalluva Maalai.

Biography
Uruthirajenma Kannar was a poet belonging to the late Sangam period that corresponds between 1st century BCE and 2nd century CE. He is known to be short-tempered, with his eyes seething in rage most of the times. Hence he was known by the name "Uruthirajenma Kannar", which literally means "he who has eyes raging with anger".

View on Valluvar and the Kural
Uruthirajenma Kannar has authored verse 31 of the Tiruvalluva Maalai. He opines about Valluvar and the Kural text thus:

Water springs forth when the earth is dug, and milk when the child sucks the mother's breast, but knowledge when the poets study Valluvar's Cural. [Emphasis in original]