Thomas Sailly (1553–1623) was a Jesuit military chaplain and author of devotional writings in the Spanish Netherlands.
[1] He was raised by his maternal uncle, Philippe de Parenty, who was canon of the collegiate church of Saint-Walburga in Veurne.
Sailly was ordained priest on 25 January 1578, and was appointed under-regent of Marchiennes College at the University of Douai.
[1] On 7 September 1586 Sailly had his first audience with Alexander Farnese, Governor of the Habsburg Netherlands, who appointed him as his confessor.
[1] His letter to the governor's son describing his father's death was published as Ad serenissimum Rainutum Parma et Placentiae ducem ... epistola (Milan, 1595).