Lost portrait of black actor and rights campaigner Paul Robeson to go on show

Glyn Philpot's 1930 painting of actor playing Othello at Savoy one of several portrayals of people of colour in Chichester exhibition

A portrait of the actor, singer and civil rights activist Paul Robeson painted in 1930 by the British artist Glyn Philpot has been rediscovered through painstaking research, after it was sold nearly 80 years ago under the title Head of a Negro.

The painting, one of a number of Philpot's portrayals of people of colour, will go on public display in Chichester, West Sussex, from 14 May, in the first exhibition of the artist's work for almost 40 years.