"The Sedan, a glass-windowed, cloth-lined enclosed chair or litter was developed in London during the early 1630s. Its name, according to Henry Peacham (1576-1644, author of Coach & Sedan, 1636) derives from the Principality of Sedan on the Meuse, an important centre of cloth manufacture and a Protestant enclave on the North European mainland. The two names ‘sedan’ and ‘chair’ were commonly combined curing the first decade of the 18th century and by the late 19th century the combined term came to describe all hand-carried transport with a seated occupant. Many European countries extended the use of earlier terms to include this new glass-windowed carrying chair. So France used chaise a porteur(s) and Spain silla de manos. In Italy portantina replaced seggiola, whilst in Germany Sänfte described the new chair as well as the mule-litters already in use."
Via: A Brief history of the Sedan Chair