Hades is the Greek god of the underworld. He is based on Keats, and died in 1831. It can be assumed his head was not one of those used in the Ritual, as Ananke is seen to be stabbing him in the chest.
Inanna is the Sumerian goddess of love. She appeared in the form of Claire Clairmont, and was the final member of the Pantheon to die, with Ananke removing her head to complete the Ritual.
Lucifer is the Christian devil. He appeared in the form of Lord Byron, and died in 1831. His head was unusable as his life force was drained by the creature.
Minerva is the Roman goddess of wisdom. She isn't seen or referenced, but she is believed to appear in this recurrence, taking the role of Ananke in the next recurrence. It is unknown if she was based on a Romanticist figure.
Greek goddess, Queen of the Underworld. Head taken by Ananke in France in 1830. It is unknown as to who exactly she was based upon. However, it is likely that she was based upon George Sand