The Council of Trent (also: Tridentium) was held by the Catholic Church between 1545 and 1563 and aimed at addressing challenges posed by the Protestant Reformation, leading to doctrinal clarifications and internal reforms.
Council of Trent in full session, plate from Patin's "Tabellae selectae ac explicatae" (Padua, Ex Typographia Seminarii, 1691), engraving, ca. 1690, artist unknown; source: © The Trustees of the British Museum, https://www.britishmuseum.org/collection/object/P_1859-0709-2470, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) licence.