"The Truth About Ancient Gay History..."

The Warren Cup, (AD 5–15) was purchased by the British Museum for 1.8 million pounds in 1999, the most expensive single purchase by the museum at that time.

This silver cup provides evidence for physical intimacy in the Roman Empire, with scenes of two male couples making love. While to modern viewers, images of a young man with a boy are highly controversial, Roman society considered that the age difference made the relationship acceptable.

A Roman man was free to choose sexual partners of either gender. The Romans believed men should be dominant, both socially and sexually, so as long as a man remained the active partner in any sexual encounter, his masculinity and status was not in question.

This cup was bought by the American art collector Edward Perry Warren (1860–1928). He referred to the cup as the “Holy Grail” and treasured its vivid portrayal of same-sex desire.

Source: https://en.wikipedia.org/wiki/Warren_Cup