Career
After ordination he was assigned to preach and give the Advent course at Court in 1744, during which year he published his Life of Ignatius Azevedo modelled on the original Italian biography by Father Cabral (a pseudonym of Giulio Cesare Cordara, 1743). De Beauvais dedicated his version to King Stanislans of Poland. In 1854, these "40 martyrs of Brazil" were canonized.
He also wrote a number of other works of devotion and for spiritual reading.
In 1759, he was confessor of Mme Louise de France. De Beauvais probably died in Paris in 1773.