Jacques Sirmond (12 October 1559 – 7 October 1651), pseudonym Jacobus Cosmas Fabricius, was a French scholar and Jesuit.
Simond was born at Riom, Auvergne, France on 12 October 1559.[1][2] He was educated at the Jesuit College of Billom. After having been a novice at Verdun and then at Pont-Mousson, he entered into the order on 26 July 1576. After having taught rhetoric at Paris he resided for a long time in Rome as secretary to Claudio Acquaviva (1590–1608). In 1637 he was confessor to Louis XIII.[3] He died on 7 October 1651 in Paris.[2]