Rubens's Pallas and Arachne was copied by Juan Bautista Martínez del Mazo, the
Spanish Baroque painter and son-in-law of Diego Velázquez. Velázquez positioned
Mazo's copy of Pallas and Arachne behind him during his composition of Las
Meninas, which he paired with another painting about different contest of the arts
between gods and mortals (Apollo as Victor over Pan). The copy of Pallas and
Arachne was then painted into the background of the scene in Las Meninas, which
would go on to be one of the most recognized and analyzed canvases in the history
of western art.
A copy by Rubens of Velázquez's favorite work, Titian's The Rape of Europa, was
owned by The Royal Collection of Philip IV. The work can be seen in the background
of Pallas and Arachne, which in turn can be seen in the background of Las Meninas
https://en.wikipedia.org/wiki/Pallas_and_Arachne
Tizian –Raub der Europa