By 1553, Jacques embraced the teachings of John Calvin, and became a Hugenot Protestant. He narrowly escaped the Bartholomew's Day Massacre in Paris when 4,000 Protestants were killed by Catholics, 24 August 1572.
Jacques was in Paris on that fateful day, but was able to escape the unruly mob gathered at the edge of the city. In the skirmish that ensued, he suffered a slashed forearm. Unfortunately, the 90 mile trip back to the family chateau at Chaisneys de Taincourt in Normandy required two weeks of travel over a secret trail, away from the main route. Blood poisoning set in, and his arm was amputated. He died on January 2, 1574 and was buried in the family plot. His son Launcelot became lord of the chateau.