The Botataung Pagoda also spelled Botahtaung; (literally "1000 military officers") is a famous pagoda located in downtown Yangon, Myanmar, near the Yangon river. The pagoda was first built by the Mon around the same time as was Shwedagon Pagoda according to local belief, over 2500 years ago, and was known as Kyaik-de-att in Mon language. The pagoda is hollow within and houses what is believed to be a sacred hair of Gautama Buddha. The Botataung Pagoda was completely destroyed during World War II, and was rebuilt after the war.
In 1859 by the Royal Order of King Mindon of Burma, the gilded bronze image of the Buddha was cast in the Mandalay Palace. The gilded image was made up of gold, silver, bronze, iron and lead in different proportions. Inside the Buddha image, King Mindon enshrined Buddha relics and consecrated and kept the image in the Royal Palace for the Royal Family to pay homage. This image of the Buddha became known as the Royal Palace Bronze Image.
In 1885 the British annexed upper Burma and took over the Royal Palace. King Thibaw and Queen Supayalat went into exile in India. The Royal Palace Bronze Image was taken by the British Army and shipped to Britain.
On the 4th January 1948, Burma regained its independence and the Burmese government requested the British government to return all the royal possessions taken from the Mandalay Royal Palace. The Royal Palace Bronze image had been displayed at the Victoria and Albert museum for 66 years but was returned from Britain and finally reached Burma on the 17th June 1951. After residing in a temporary shrine, the Royal Palace Bronze Image was transferred to to a newly built glass panelled shrine here at the Botahtaung Pagoda.

Source: https://en.wikipedia.org/wiki/Botataung_Pagoda and onsite information