Alison Weir
Alison Weir is the biggest-selling female historian (and the fifth best-selling historian) in the United Kingdom since records began in 1997. She has published thirty titles and sold more than 3 million books - over a million in the UK and 2.2 million in the USA. She is now working on two concurrent series of books: Six Tudor Queens, comprising six novels on the wives of Henry VIII (with associated e-books, above), and England's Medieval Queens, a quartet of historical works of non-fiction.
Source: alisonweir.org.uk