Pomeroy's book was one of the first to tackle the real lives of Greek and Roman women, and though it has been superceded by a huge literature on the subject, it's still an excellent and worthwhile place to start.
Starting with the Greek and Roman pantheon of goddesses, she works through a historical survey of women's lives taken from both material and literary evidence, starting with the Bronze age, working through classical Athens, the Hellenistic period, the Roman republic and through to the late empire and christianity.
Because of the vast time period covered, this is a book which surveys the reality of women's lives rather than going into specific details, but there are some excellent points made, and ample bibliography for scholars wanting more specific details. Altogether an easily-readable volume that packs a huge amount of relevant information into a very little space.