
Based on the provided context, it is not possible to determine when the sofa was invented as the search results do not contain relevant historical information.
Drawing from general knowledge, the concept of a sofa-like piece of furniture dates back thousands of years, though not in the form we recognize today. The ancient Egyptians are known to have used raised seating platforms with cushions around 2000 BCE, primarily for the elite. The word "sofa" itself is derived from the Arabic word "suffah," which referred to a wooden bench covered with cushions and blankets.
The modern upholstered sofa as we know it began to take shape in Europe during the late 16th to early 17th centuries. During this period, advancements in upholstery made comfortable, fabric-covered seating more common, although it remained a luxury item for the aristocracy. A significant milestone in the sofa's history is the creation of the Chesterfield sofa, which was reputedly commissioned in the mid-18th century by Lord Philip Stanhope, the 4th Earl of Chesterfield.
It was not until the Industrial Revolution in the 19th century that sofas became widely accessible to the middle class due to mass production techniques, solidifying their place as a staple piece of furniture in households.


