Who is Rosie Driffield/Iggulden (née Gann) from Cakes and Ale: Or the Skeleton in the Cupboard and what is their importance?

Rosie was the renowned late-Victorian author, Edward (Ted) Driffield's first wife. She later left Driffield and emigrated to America with her second husband, George Kemp. In order to escape the scandal and lawsuits, the couple changed their surname to Iggulden .