Legend is a 2015 biographical crime thriller film[7] written and directed by American director Brian Helgeland. It is adapted from John Pearson‘s book The Profession of Violence: The Rise and Fall of the Kray Twins,[8][9] which deals with their career and the relationship that bound them together, and follows their gruesome career to life imprisonment in 1969.[10][11]
This is Helgeland’s fifth feature film. Tom Hardy, Emily Browning, David Thewlis and Christopher Eccleston star with Colin Morgan, Chazz Palminteri, Paul Bettany, Tara Fitzgerald and Taron Egerton as well as the singer Duffy featured in supporting roles.
source : wikipedia