From the "about" page: "Matilda is the first in a family tree of Marchmont women, each of whom lives in an exciting time in English history. We can follow all of their stories in the A Girl for All Time® series. Each girl features in her own set of novels and Keepsake books and they can all trace their family tree all the way back to Matilda, who lives in Tudor times during the reign of Henry VIII."
Check out the site here (http://www.agirlforalltime.com/).