Archaeologists have discovered a well-preserved, 4,400-year-old tomb of a royal priest and his family in Egypt, in a “one of a kind” find, the Egyptian authorities announced on Saturday.

The tomb was unearthed in Saqqara, a city south of Cairo and a vast necropolis from ancient Egypt.

The discovery dates from the rule of Neferirkare Kakai, the third king of the fifth dynasty of ancient Egypt, according to Khaled al-Anani, Egypt’s minister of antiquities. The fifth dynasty governed for less than two centuries, from 2,500 B.C. to about 2,350 B.C., according to the Metropolitan Museum of Art.

The tomb had remained untouched, said Mostafa Waziri, the secretary general of Egypt’s supreme council of antiquities, according to Reuters.