While archaeological evidence is always being uncovered, as of right now I believe the most ancient goddess is Inana of the Sumerian religion.
Ishtar, goddess of war and love.
The most popular goddesses in Ancient Egypt were -Isis -Hathor -Bastet
The goddess who was most likely to be the goddess of corn is Demeter because she was the goddess of harvest and the godess of grain so corn has something to do with it.
In Ancient Greece, oaths sworn to Gaia; the embodiment of Earth as well as the goddess of dreams, motherhood and nature; was considered to be the most binding.
"The most awful and wondrous goddess of all pertains to my most beautiful twin sister, Kelly of Wooldridge."
The ancient Greeks believed that she did. Now most people do not take Greek Mythology as a religion any more, but part of our history. It's a matter of rather you believe in the ancient myths or not.
Sekhmet did not rule Egpyt, she was the ancient Egpytian goddess of divine retribution, vengeance, and conquest. Her cult center with Ptah and Nefertem was Memphis. She was worshiped in Upper Egypt.
Bastet was originally a fierce lioness warrior goddess of the sun worshiped throughout most of ancient Egyptian history, but later she was changed into the cat goddess that is familiar today, becoming Bastet. She then was depicted as the daughter of Ra and Isis, and the consort of Ptah, with whom she had a son Maahes.
The goddess, "Isis", the goddess of protection, magic, and personal salvation is often considered the most important goddess of ancient Egypt, but the goddess, "Mut", might share the honor, as she was the goddess of all living things, and was considered the "Queen" of goddesses.
Cleopatra is arguably the most famous female of ancient history. There is no surviving diary of Cleopatra's, however, there are many books written in the form of a diary about her.
Farming.
The Armenians are one of the most ancient people in history, they are indo-european and they have one of the most ancient civilizations in the world.