Scientists in Warsaw were surprised to discover that an ancient Egyptian mummy they thought to be that of a priest was, in fact, of a pregnant woman.

The finding is the first known case of a pregnant woman mummified and was discovered during an X-ray.

The well-preserved mummy was brought to Warsaw in 1826, in a coffin inscribed with the name of a male priest, according to the Warsaw Mummy Project which carried out the research.

The scientists said they believed the woman came from the elite of Theban community and was between 20 and 30 years old and 26 to 30 weeks pregnant.