-- Who is depicted?
In Greek as well as Roman mythology, Hygieia (also Hygiea or Hygeia), was the daughter of the god of medicine, Asclepius, and Epione. She was the goddess/personification of health, cleanliness and hygiene.
Hygieia as well as her four sisters each performed a facet of Apollo's art: Hygieia ("Hygiene" the goddess/personification of health, cleanliness, and sanitation); Panacea (the goddess of Universal remedy); Iaso (the goddess of recuperation from illness); Aceso (the goddess of the healing process); and Aglïa (the goddess of beauty, splendor, glory, magnificence, and adornment).
Hygieia also played an important part in her father's cult. While her father was more directly associated with healing, she was associated with the prevention of sickness and the continuation of good health. Her name is the source of the word "hygiene". She was imported by the Romans as the goddess Valetudo, the goddess of personal health, but in time she started to be increasingly identified with the ancient Italian goddess of social welfare, Salus.
-- More about the artist
The artist is still unknown of this piece.