When was the pillow case invented?

The pillowcase, as we know it today, was likely invented in the late 19th century as bed linens became more standardized. Prior to this, pillows were often covered with cloth sacks or pillow ticks. The exact date of the invention of the pillowcase is not definitively known, but it is believed to have become popular in the late 1800s as a convenient and hygienic way to protect pillows and make them easier to clean.