The 600 objects from a historical collection in Bristol were of "very, very significant" cultural value.
Comedian Auvab Pal says many have "moved on from the empire" in India.
It's now largely forgotten that in the early 1900s, nearly a third of the Arabian Peninsula was under British India.
The monument was constructed in 1834, a years after slavery was abolished across the British Empire.
The display includes letters from the early American colonist John Winthrop, organisers says.
The contribution of hundreds of mostly black servicemen had gone unrecognised until now.
The artefact was acquired in 1923 by Pitt Rivers Museum - where it has never been displayed.
Some of the royal artefacts were stolen by British colonisers during the 19th Century Anglo-Ashanti war.
Butter sculptures of British royalty and a working coalmine were on display but what was it all for?
