St.Dominic was born around 1170 into a noble Castilian family related to the royal family. He was born in Caleruega(Burgos), in the Spanish Old Castile, at that time still an small fort-colony on the Christian border. Tradition identifies Dominic as the third son of a pious Christian family formed by Juana de Aza and his father Felix de Guzman, a knight to whom the small territory was entrusted. From early age, his parents imbued him with a deep experience of faith. After studies with an uncle who was a priest, Dominic pursued his education at the university of Palencia. There while advancing in the knowledge of Sciences, he felt Gods call to serve His peoples needs and became a priest. Around 1196 Dominic became a canon regular at the cathedral of Osma, close to his native place. In this manner he spent his first years as a priest studying, praying and occasionally helping out in pastoral activities. His talents did not pass unnoticed, and by 1201 he became the subprior of the Chapter of Canons. A contemporary description says of him:

Straight way he began to appear among his brother canons as a bright ray of sunshine, in humbleness of heart the least, in holiness the first, shedding around him the fragrance of quickening life, like the scent of pinewoods in the heat of a summers day. And advancing from strength to strength as does the wide-growing olive and the slender, lofty cypress, day and night he frequented the church, ceaselessly devoted to prayer, scarcely venturing beyond the cloister walls, the more to find leisure for his lone thoughts with God

In 1203 his cloistered peace was disturbed by his bishop Diego de Acebes, who summoned him to go on a diplomatic mission to Northern Europe. As he traveled through Southern France he saw the terrible situation of the Catholic Church devastated by the dualist Albigensian heresy. Moved by compassion and convinced that someone should preach the truth to those benighted people, he discussed with his bishop the project of giving missions among them. In 1205 when his second diplomatic journey was over, requested the Pope to be sent to preach the faith to the Tartars. However, the Pope sent them on a more needed mission, to assist Cistercians Abbots in preaching the true Catholic faith to the albigensians. Imitating the apostles, traveling about on foot, in poverty and humility, begging their bread from door to door, spreading the true gospel Diego and Dominic began their work around Prouille (southern France), where Diego established a community for women converted from heresy. Few months later the bishop died and the Cistercians went home discouraged by lack of results. Dominic was left with a handful of followers on his own. He continued to preach peacefully the true faith, until it was possible for him. Since Dominic accompanied his words with his example of true evangelical poverty and constant prayer, his preaching proved efficient. His constant desire was to bring to everybody the truth of the faith, which would set them free and save their souls. Dominic was concerned that he and his preachers should know their faith thoroughly and be able to expound it competently.

Although others had already attached themselves to Dominic and his work, it was only in 1215 that Peter Selhan, a rich burgher of Toulouse gave Dominic a house and together with another man named Thomas, bound himself to Dominic by religious profession. This was the institutional beginning of the religious community which became the Order of Preachers. Fulk, the bishop of Toulouse welcomed the new group and gave them official status as preachers. But St. Dominic wanted more. He asked the Pope his blessing to the new community and to approve it as an Order of Preachers for the whole Church. In 1216 Pope Honorius III granted Dominic his request, formally establishing his group as an institution in the Church.

Dominic spent the five last years of his life preaching and organizing the Order. In that brief period he attracted to the Order so many of the saintly and talented men of the times that his death did not in the least menace the carrying out of his ideal; men who had heard him preaching went off joyfully to die in Tartary, or to debate with heretics, or to teach in the universities, or to teach catechism to the young. Five years of his magnetic presence was enough to magnetize the whole Order, so to speak, so that in the first hundred years of its existence it would draw nearly 30,000 members from all the countries of Europe, and start on its way around the world.

Dominic died in Bologna on August the sixth, 1221. He had lived long enough to see his Order established so firmly that no persecution or trouble would shake it. When dying, he promised his weeping brethren that he would be of more use to them in heaven than he was on earth - a promise which he has since kept in abundant measure.

The burial of St. Dominic took place, according to his wishes, in extreme simplicity. He was buried in a modest grave, "under the feet of his brethren." Here he remained until the urging of Pope Gregory IX - who was a personal friend of his - gave rise to the first translation of the relics. This translation took place in 1233, 'at the time of a general chapter or general assembly of the representatives of the whole Order. Blessed Jordan, his successor, presided over the ceremony and all were filled with great emotion as the relics were exposed after twelve years' burial. Testimonials were given in writing of the sanctity of Dominic by those who had worked with him and knew him best. Pope Gregory IX had the evidence carefully preserved, and in the following year (1234) he proclaimed that Dominic was a saint of God and entitled to the highest honors of the Church.