According to The Hollywood Reporter, Romola Garai (Vanity Fair), Michael Gambon and Rufus Sewell have joined the cast of Michael Apted's Amazing Grace, producers said Tuesday.

The trio joins a burgeoning cast for the Walden Media movie that is toplined by Ioan Gruffudd as British anti-slavery pioneer William Wilberforce and Albert Finney as Wilberforce's confidante John Newton. Shooting began this week on the movie that follows Wilberforce's 18th century political career, which placed him at odds with some of the most powerful men of the time, including the king.