The
monastic order which was the driving force behind the
Spanish Inquisition. Heavily interested in purging
heresy, they were the ones who led most of the burnings and
torture. Oddly enough, the church itself was usually rather level-headed about the whole business, and stopped at
excommunication.
There fighting colours are still black and white. The motto of the order is simply 'veritas'. Most famous Dominican was probably Thomas Aquinas.
Eventually, their role as the favourites of the nobility was overtaken by the Jesuits.