St. Sebastian (3rd century)
An officer of the Roman army, Sebastian visited persecuted Christians in prison, bringing supplies and comfort. Soon he was converting his fellow soldiers. Furious, the Emporor had him tied to a tree and shot with arrows. He survived and later returned to preach to him. He was then beaten to death.

Reflections from the Saints

The Church is the only one, the Roman Catholic! And if there were left upon earth but one Catholic, he would be the one, universal Church, the Catholic Church, the Church of Jesus Christ against which the gates of Hell shall never prevail.
– Bl. Anne Catherine Emmerich