Welwyn Garden City is a town in Hertfordshire, England, 20 miles (32 km) north of London. It was the second garden city in England and one of the first new towns. It is unique in being both a garden city and a new town and exemplifies the physical, social and cultural planning ideals of the periods in which it was built.

Louis Emanuel Jean Guy de Savoie-Carignan de Soissons CVO RA FRIBA (1890–1962) was the younger son of Charles de Savoie-Carignan, Count de Soissons. An architect, he was called for professional purposes Louis de Soissons.