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When enough had collected in the clay pot at the edge of the quern, the two sisters — the third Navarro sister, Crispina, was an amused bystander — squeezed out its impurities using a wet cloth.

Decorated querns and millstones of any date are extremely rare, with only four such Roman millstones discovered from around a total of 20,000 nationwide, said Steve Sherlock, Highways England's archaeology lead for the A14.

Bone was also found with a piece of quartz from a stone tool and a quern stone, which was used for grinding food.

A device called the rotary quern, a type of hand mill, became common in Central Europe in the late Iron Age.

Other examples of complex technologies that diffused east and west in the ancient Old World, from a single West Asian source, include door locks, pulleys, rotary querns, windmills—and the alphabet.