Gaspar was ordained for the diocese of Rome on July 31, 1808. Gaspar was a very gifted and popular preacher.  Shortly after his ordination Gaspar, along with all the clergy of Rome, was forced to take an oath of allegiance to Napoleon who had suppressed the Papal States. Gaspar refused to take an oath stating: “I would rather die or suffer evil than to take such an oath. I cannot, I must not, I will not.” Because of this response Gaspar was exiled and imprisoned.

While in prison, Gaspar envisioned the possibility of a community of men dedicated to the spirituality of the Precious Blood.  On August 15, 1815, Gaspar founded the Society of the Precious Blood.  He invited his newly formed Community to live in mission houses in a bond of charity and to be missionaries of the Word by preaching missions and retreats.

Gaspar died on December 28, 1837.  On June 12, 1954, Gaspar was canonized a saint of the Church.

The Kansas City Province extends from Indiana to Arizona and from North Dakota to Texas.  To facilitate the gathering of members in various parts of the province, districts were established in 1971.

In 1989 lay men and women were invited to participate in the spirituality and the apostolate of the Precious Blood by forming Companions of the Precious Blood. As Companions these men and women make covenants with the Society of the Precious Blood.

The members and companions of the Missionaries of the Precious Blood continue the charism of their founder, St. Gaspar, preaching renewal and reconciliation.  Individuals follow the call of God, using their gifts to further the kingdom of God through their particular apostolates, always mindful that all are brothers and sisters through the blood of Jesus.