Born in Spain, His mother had a vision while carrying him in her womb of a dog holding a torch in it's mouth that "seemed to light the earth on fire." Dominic means "Dog of God", and the torch is the torch of knowledge of God, which is one of the main pillars of the Dominicans.
Dominican Friars at the 2009 March for Life
Approved on December 22, 1216 in France, the Dominicans were founded to preach the Gospel and combat heresy, the order is famed for it's intellectual tradition, having produced many leading theologians and philosophers. The order does not just include friars, but nuns and laypeople as well.
There is a popular story (I'm not sure if it's actually a story...) of Our Lady giving the Holy Rosary to St. Dominic, telling him of it's power and how to use it. The Dominicans have thoroughly spread the message of Rosary and it's power.
St. Dominic died at the Church of San Nicolò of the Vineyards on August 6, 1221. He was canonized on July 13, 1234, by Pope Gregory IX.
Click on his name to read more on the life of St. Dominic.