31st century BC in the context of "Djer"

Djer (also Zer or Sekhty; fl. c. 3000 BC) is considered the third pharaoh of the First Dynasty of ancient Egypt in current Egyptology. He lived around the mid 31st century BC and reigned for about 40 years. A mummified forearm of Djer or his wife was discovered by Egyptologist Flinders Petrie, but was discarded by Émile Brugsch.