Charles Jean Marie Loyson (10 March 1827 – 9 February 1912), better known by his religious name Père Hyacinthe, was a famous French preacher and theologian.

[4] One brother, Jules Theodore Loyson, became a priest and professor at the Collège de Sorbonne in Paris,[1] and one sister became a nun.

He eventually resigned his post to assume the vows of a friar of the Order of the Carmelites, taking the religious name of Hyacinthe.

His manifesto against the alleged abuses in the Church created intense excitement, not only in France, but throughout the civilized world, and the young monk was hailed as a powerful ally by all the open opponents of the Papacy.

He was warmly welcomed by the leading members of the various Protestant sects in the United States, and though he fraternized with them to a certain extent, he constantly declared that he had no intention of quitting the Catholic Faith.

[7] A law was enacted that restricted episcopal and parochial jurisdiction in the canton unless sanctioned by the government; and that, for the future, all parish priests should be elected by the Catholic inhabitants, and be removed, if shown sufficient cause, by the State.

He died in February 1912, in Paris, in the apartment of his playwright son, Paul Hyacinthe Loyson, and was buried in Père Lachaise Cemetery.