Jean Baptiste de la Barrière (ʒɑ̃ də la baʁjɛʁ; 1554–1600) was a religious figure. He was named reformer of the Feuillants at the age of 19. During his life he became a spiritual adviser to King Henry III of France

Henry III of France

Henry III was King of France from 1574 to 1589. As Henry of Valois, he was the first elected monarch of the Polish-Lithuanian Commonwealth with the dual titles of King of Poland and Grand Duke of Lithuania from 1573 to 1575.-Childhood:Henry was born at the Royal Château de Fontainebleau,...

. During 1587 Henry III built a monastery for the Feuillants to commemorate his friendship with Jean.

Jean lived a patient, compassionate life and adopted routines such as sleeping on the floor with a stone pillow and eating without tables. Jean did not nor did he allow his followers to eat fish or eggs. The feuillants used herbs for sacred rituals.

A couple of Jean's followers attempted to assassinate him via poison, but he survived.

After the assassination of Henri III, Jean de la Barriere was forced into lay communion

Lay communion

Lay communion is a term applied in the Catholic Church, to describe the status of a cleric who is in communion with the Church, but only with the standing of a lay person...

 by the church. However this did not last long. With the help of his friend Countess Catherine Nobili Sforza, he was reinstated. Jean died soon after in the arms of his friend Cardinal Arnaud d'Ossat

Arnaud d'Ossat

Arnaud d'Ossat was a French diplomat and writer, and a Cardinal of the Roman Catholic Church, whose personal tact and diplomatic skill steered the perilous course of French diplomacy with the Papacy in the reign of Henry IV of France.-Early life and studies:Arnaud d'Ossat was born at...

 during the year 1600.

After his death Jean's heart was kept and preserved by the church. He received the first degree of Sanctity from the Roman Catholic church and was given the title of Venerable.