I was sometimes called 'coconut' when I was at school.

The fact that I was black and desirous to do my work, the other kids would call me a coconut, as if I were somehow attempting to be white. The bullying was real: I'd get punched, spat at, terrible things.

I turn down a lot of movies because sometimes they glamorize violence or the darker side of sex or criminality.

I know I had my equivalents in Adrian Lester and Lenny James when I was at drama school. I remember David Harewood doing 'Othello' at the National, and Adrian Lester having done Cheek by Jowl's famous 'As You Like It and Company' at the Donmar. Not necessarily performances I saw, but just the fact they happened was massively encouraging.

You can't afford for there to be gaps in your pool of knowledge when it comes to a character; otherwise, what ends up onscreen is generalized and unspecific.

My grandfather was the king of a region in western Nigeria, where I had the privilege to live for seven years while growing up. But what we think of as royalty in the U.K. is very different to royalty in Nigeria: if you were to throw a stone there, you would hit about 30 princes.