PHILADELPHIA — University of Pennsylvania archaeologists say they have found the tomb of a previously unknown Egyptian pharaoh who ruled more than 3,600 years ago, the first discovery of what they predict could be more than a dozen tombs from a forgotten dynasty.

The tomb, found last week, was heavily looted, but hieroglyphs on the chamber walls clearly identified it as belonging to a ruler named Woseribre Senebkay, the Penn team announced Wednesday in conjunction with the Egyptian government.

The researchers already have begun excavating several nearby sites that appear to be from the same dynasty, at the site of the ancient city of Abydos, more than 300 miles south of Cairo, said Josef Wegner, a Penn associate professor of Egyptology.

“It looks like there’s a whole royal necropolis of this lost dynasty,” said Wegner, an associate curator at Penn’s Museum of Archaeology and Anthropology.

Archaeologists had suspected the existence of the unknown pharaohs from an ancient list of rulers called the Turin King List, portions of which are torn and decayed.

By analyzing fragmented parts of the list, a Danish researcher named Kim Ryholt proposed years ago that 16 unknown kings had belonged to the Abydos dynasty.

The name of Senebkay matches one of the partial names on the list, said Wegner, who identified the tomb’s occupant with the help of graduate student Kevin Cahail. Some other names on the list are obliterated.

“They basically were forgotten to history,” Wegner said. “In the later king lists, they don’t appear. They just kind of vanish.”

The tomb, dated to 1650 B.C., appears to have been raided by tomb robbers in ancient times, Wegner said. Even the king’s bodily remains were ripped apart.

Preliminary work on the skeleton, conducted by Penn graduate students Paul Verhelst and Matthew Olson, suggests that Senebkay stood about 5-foot-10 and died in his mid- to late 40s.

The tomb contained remains of a funerary mask, a coffin, and a cedar chest that would have been used to house the king’s internal organs, customarily removed before burial.

The chest apparently had been reused from the nearby tomb of an earlier king who already was known to history.