5. During the 4th and 5th centuries AD, the Roman Catholic Church discouraged Europeans from the use of soaps and bathing in general, linking them to the pagan ways of previous empires and other cultures. This decline in hygiene is thought to have heavily contributed to the spread of plague during the Black
6. Death (1348-1350) and other diseases.
Vikings used very strong, lye-based soaps, not just for cleaning, but also to bleach their facial hair.
7. Islamic cultures in medieval times encouraged the use of soaps, and the Syrian city of Aleppo was known for producing a high-quality soap popularized on the Silk Road trade route.
8. While soap use was not widespread in Europe during the middle ages, toiletry soaps were made in small batches in Marseilles, Italy, and Spain, but were too expensive for most people. White soaps made from olive oil in Castile, Italy, became so coveted that all fine white olive oil soaps eventually were referred to as Castile Soap.
9. Soap became more accessible when the Frenchman LeBlanc discovered a chemical process in 1791 that allowed for the cheaper production of soaps. Further discoveries about the soap making process in the 1800s would add to reduced costs and popularity, as would more knowledge about the links between health and hygiene.
10. The rise in using soap for hygiene is often attributed to British soldiers in the Crimean War (1854-1857), when there was a notable decrease in deaths due to disease after Florence Nightingale brought hygienic practices into field hospitals. American soldiers further popularized soap use when they adopted these same practices during the U.S. Civil War (1861-1865).
11. The first documentation of liquid soap came in 1865 when William Shepherd patented the product. However, popularity of liquid soap did not occur until B.J. Johnson began marketing his Palmolive soap in 1898.