the ancient Celts
The lowest class of people in ancient Egypt were slaves.
i think it is the peasants like in Egypt's social classes.
The indigenous people of Egypt are the Egyptians. The Copts are the only group of people who are uniformly descendants of the Ancient Egyptians while most Egyptian Muslims (the Arab Egyptians) are a mix of Ancient Egyptian ancestry and Arabian ancestry.
Ancient Mizraim is Ancient Egyptian. This is the group that named the land of Egypt.
The scribes were a group of people in ancient Egypt who knew how to read and write. They wrote on papyrus using reed brushes dipped in ink.
The lowest class that included the slaves and farmers did the most manual labor in ancient Egypt.
It is a group of people that capture ghosts that are scaring people.
There is no specific collective noun for a group of ancient people, in which case a noun suitable for the context of the situation is used; for example a study of ancient people, a settlement of ancient people, a remainder of ancient people, etc.
A political group of people
Empire
The book of the dead, or the pyramid texts.
Cleopatra lived in ancient Alexandria. To see a location map and get an idea of all of ancient Egypt, click on Alexandria in your computer browser. The wikipedia entry in your select group has a map of the ancient city's location and the rest of Egypt.