Centaurs of the Rothenian Plains

The seemingly endless expanses of the Rothenian plains are home to savage halflings and brutish gnolls, but feared above all are the great herds of nomadic centaurs.
A proud and fierce people, the centaurs are respected for their great aptitude for the longbow, and carry flint-headed spears which they wield with deadly skill. Some have found them to be just and fair-minded.
Others say they are merciless and brutal. Perhaps there is some truth in both perspectives...