Chang and Eng Bunker
Chang Bunker (Thai: จัน บังเกอร์) and Eng Bunker (Thai: อิน บังเกอร์) (May 11, 1811 – January 17, 1874) were Siamese-American conjoined twin brothers whose fame propelled the expression "Siamese twins" to become synonymous for conjoined twins in general. They were widely exhibited as curiosities and were "two of the nineteenth century's most studied human beings".