What is "spoliarium"

The Spoliarium (often misspelled Spolarium) is a painting by Filipino artist Juan Luna. The painting was submitted by Luna to the Exposición Nacional de Bellas Artes in 1884 in Madrid, where it garnered the first gold medal (out of three). In 1886, it was sold to the Diputación Provincial de Barcelona for 20,000 pesetas. It currently hangs in the main gallery at the ground floor of the National Museum of the Philippines, and is the first work of art that greets visitors upon entry into the museum. The picture recreates a scene in a despoiling, a place in a Roman circus where killed gladiators are stripped of weapons and garments.