Eng (In) and Chang (Chan), the “original” Siamese twins, were born in Samut Songkhram in 1811, when Thailand was known as Siam. The boys’ bodies were joined from breastbone to navel by a short fleshy ligament, but they shared no vital organs and eventually managed to stretch their connecting tissue so that they could stand almost side by side instead of permanently facing each other.

In 1824 the boys were spotted by entrepreneurial Scottish trader Robert Hunter, who returned five years later with an American sea merchant, Captain Abel Coffin, to convince the twins’ mother to let them take her sons on a world tour. Hunter and Coffin anticipated a lucrative career as producer-managers of an exotic freak show, and were not disappointed. They launched the twins in Boston, advertising them as “the Monster” and charging the public 50 cents to watch the boys demonstrate how they walked and ran. Though shabbily treated and poorly paid, the twins soon developed a more theatrical show, enthralling their audiences with acrobatics and feats of strength, and earning the soubriquet “the eighth wonder of the world”. At the age of 21, having split from their exploitative managers, the twins became self-employed, but continued to tour with other companies across the world. Wherever they went, they would always be given a thorough examination by local medics, partly to counter accusations of fakery, but also because this was the first time the world and its doctors had been introduced to conjoined twins. Such was the twins’ international celebrity that the term “Siamese twins” has been used ever since. Chang and Eng also sought advice from these doctors on surgical separation – an issue they returned to repeatedly right until their deaths but never acted upon, despite plenty of gruesome suggestions.

By 1840 the twins had become quite wealthy and decided to settle down. They were granted American citizenship, assumed the family name Bunker, and became slave-owning plantation farmers in North Carolina. Three years later they married two local sisters, Addie and Sally Yates, and between them went on to father 21 children. The families lived in separate houses and the twins shuttled between the two, keeping to a strict timetable of three days in each household; for an intriguing imagined account of this bizarre state of affairs, read Darin Strauss’s novel Chang and Eng. Chang and Eng had quite different personalities, and relations between the two couples soured, leading to the division of their assets, with Chang’s family getting most of the land, and Eng’s most of the slaves. To support their dependants, the twins were obliged to take their show back on the road several times, on occasion working with the infamous showman P.T. Barnum. Their final tour was born out of financial desperation following the 1861–65 Civil War, which had wiped out most of the twins’ riches and led to the liberation of all their slaves.

In 1874, Chang succumbed to bronchitis and died; Eng, who might have survived on his own if an operation had been performed immediately, died a few hours later, possibly of shock. They were 62. The twins are buried in White Plains in North Carolina, but there’s a memorial to them near their birthplace in Samut Songkhram, where a statue and the small, makeshift In-Chan Museum  have been erected 4km north of the provincial capital’s centre on Thanon Ekachai.

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