Omarino was exchanged for a pair of trousers and a shirt. Ricudo was won in a game of cards.
The British public first met the embattled gazes of the two men 100 years ago when their faces appeared in the pages of the Daily News.
The British Consul Roger Casement had brought them to Britain from their homes in the Colombian Amazon to highlight the fate of their people.
In the United States, Henry Ford's Model T cars, with their revolutionary vulcanised rubber tyres, were flying off production lines. Thousands of miles to the south, the tribes of the Amazon rainforest were being enslaved, tortured and murdered in the thousands to feed the boom in the rubber that grows in trees there.
Now, Fany Kuiro, from the same Witoto Indian tribe as Omarino and Ricudo, has appealed to the world to find out what happened to her two "indigenous brothers ... so that our ancestors' spirits can rest in peace".
Casement, an Irishman, had been working as the British Consul in Rio de Janeiro when he was sent by the British Government to investigate atrocities in the Amazon at the hands of the Peruvian Amazon Company and its British directors.
"Alas! Poor Peruvian, poor South American Indian!" he wrote in his diary. "The world thinks the slave trade was killed a century ago! The worst form of slave trade and slavery - worse in many of its aspects, as I shall show - than anything African savagery gave birth to, has been in full swing here for 300 years.
"The dwindling remnant of a population once numbering millions is now perishing at the doors of an English company, under the lash, the chains, the bullet, the machete to give its shareholders a dividend."
Casement wrote in great detail of the horrific treatment of the Amazonian Indians, estimating that at least 30,000 people in the Putumayo region of Southern Colombia had been tortured, murdered or forced into slavery.
"We are sent far, far into the forest to get rubber, and if we do not get it, or if we do not get it quickly enough, we are shot," Omarino told the Daily News, a popular national newspaper founded and edited by Charles Dickens. "London is very wonderful, but the great river and the forest, where the birds fly, is more beautiful. One day we shall go back."
The men did make it back to South America in the end, but the last known record of their whereabouts shows them separated from their homes by thousands of miles of thick rainforest.
Casement's papers show that he handed them to the family of George Babbington Mitchell, the British Consul in Iquitos, the largest city on the Peruvian Amazon.
Mitchell wrote to Casement in March to tell him Omarino had taken a job on a ship heading north towards Colombia. Ricudo managed to find his wife, but Casement never learnt the couple's whereabouts.
Many of the Amazon's uncontacted tribes that so fascinate social anthropologists are thought to be descendants of survivors of the rubber-boom atrocities, who fled to remote areas of the forest to escape the killings, torture and disease that decimated the indigenous population.
In some areas, 90 per cent of the Indian population was wiped out. But it was not the actions of Casement and other campaigners that brought an end to the enslavement of the tribespeople.
The Amazon rubber boom ended because more profitable plantations were established in Southeast Asia from seeds smuggled out of Brazil by the British "bio-pirate" Henry Wickham. As for Casement, he was knighted in 1911 in recognition of his efforts on behalf of the oppressed people of the Amazon and the Congo, where he did similar work.
But his experiences there made him a strident anti-Imperialist and ultimately an Irish Republican. In 1916 he was arrested and tried for treason after the 1916 Easter Uprising. During the trial, a second diary appeared in the popular press, which purportedly revealed him to have been a promiscuous sex tourist with a fondness for young men.
As WB Yeats' poem The Ghost of Roger Casement recounts, he was hanged within three months.
- INDEPENDENT
Search for tribesmen's resting place stirs horrors
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