Between the arrival of the first Portuguese missionary in 1533, through the Dominicans and then the Jesuit missions of the 17th century, the politically inspired persecutions of the 19th century, and the Communist-led terrors of the twentieth, there have been many thousands upon thousands murdered for their faith in Vietnam. Some were priests, some nuns or brothers, some lay people; some were foreign missionaries, but most were native Vietnamese killed by their own government and people.

Jerome Hermosilla, a Dominican missionary to Manila, Philippines, and a priest, he went as a missionary to Vietnam in 1828 where he was the Vicar Apostolic of Eastern Tonking, Vietnam and titular bishop of Miletopolis. H was martyred with Saint Valentin Faustino Berri Ochoa.

Valentin Faustinao Berri Ochoa. Born in the Basque country, and ordained on June 14, 1851, Valentin was a missionary to the Philippines and then to Vietnam. He was appointed coadjutor vicar apostolic of Central Tonking, (the modern diocese of Bùi Chu) Vietnam and titular bishop of Centuria on December 25, 1857. He was martyred with Saint Jerome Hermosilla.

Francis Gil de Frederich was educated in Barcelona, Spain where he joined the Dominicans. He was a missionary to the Philippines first and then a missionary to Vietnam in 1732. He spent nine years in prison for his faith during which time he converted fellow prisoners and supervised evangelists on the outside.

Hyacinth Castaneda was a Dominican Priest and missionary to China. He then was sent as a missionary to Vietnam. He was beheaded for his faith in 1773 in Vietnam