I recently added these two new images to the Trombone History Timeline (17th Century—1st half). Both are from the early part of the Baroque period. They illustrate two important activities of trombonists of the time (playing for a royal funeral and performing for a royal procession). The second picture was in the timeline already, but this version is a clearer, higher-resolution detail that I recently found. Be sure to click on the first picture for a larger version; it expands quite a bit. Enjoy!
1608—Nancy, France: An engraving by Friedrich Brentel depicting the funeral of Charles III, Duke of Lorraine, includes 2 trombonists performing with other musicians in a loft of St. François Church (see detail and full image below; public domain) (“Obsequies of Charles III, Duke of Lorraine,” Bibliotheque Nationale, Paris; see also Lesure 60 and Whitwell, Baroque 25). Click to expand detail. You can also find the image online at the Metropolitan Museum of Art.
1613—Heidelberg, Germany: The welcoming festivities for Elector Friedrich V of the Rhine Palatinate and his Bride, Princess Elizabeth of England, include a series of triumphal arches constructed along the streets by the faculties of the University of Heidelberg. At the first arch, staged by the Faculty of Philosophy, “pleasing music was [performed] by trombones and cornetts.” The festival record continues, “His Highness the Elector, as well as his spouse, were received with a cordial and very lovely musical [performance with] all kinds of string-playing and [other] instruments. Up high [on the stage] stood an angel who blew on two [sic] sackbuts….When His Highness the Elector, as well as the princes, were escorted in the procession by the four faculties of the world-famous University of Heidelberg, [they] passed through four triumphal arches [surrounded by] many well-wishers. Upon the first archway, which was hung with tapestries, sweet music by sackbuts and cornetts was presented” (Bowles, Musical Ensembles 188). A graphic representation of the welcoming ceremonies depicts a group of musicians, including 3 trombones, performing on a triumphal arch (see below detail; public domain) (Bowles, Musical Ensembles 190; Guion, A History 103).