Just added the below image and caption to the Trombone History Timeline (16th century). It’s a little like playing “Where’s Waldo,” but if you look closely, you’ll see two trombones there (be sure to click on the picture for a larger version).

c. 1550—A leaf of various studies by artist Solis Virgit (1514-62) includes 2 trombones (see upper-right and lower-middle of below image—click for larger version; public domain) (Louvre).