Added the below image and caption to the Trombone History Timeline (17th century, first half).
1621—Valladolid, Spain: Procession of Our Lady of San Lorenzo, a painting by Matias Velasco in the Church of San Lorenzo, includes a trombone among a group of musicians (see detail and full image below; public domain).
Luís Henriques
Hi Will,
Thanks for the reference for this painting. I didn’t remember where it came from.
All best,
wkimball
You’re welcome, Luis!