Antony-Armstrong-Jones, Earl of Snowden, born Antony Charles Robert Armstrong-Jones, is played by Matthew Goode.
Season 2
Anthony first appears in a wedding of a mutual friend of him and Margaret, he ignores her for most of the moment. Afterward's one of Margaret's assistants is having a small party in her house where the princess attends and there she meets the charming Mister Armstrong and forms a flirty relationship with him. He then agrees to take Margaret's photograph and in that meeting he tries to seduce her, Margaret gives little interest on that count, but it's just to maintain a certain.
Margaret asks for him to send the photograph to the paper for her birthday photo, which once published made a scandal, Anthony then took her home and let her keep the helmet of his motorcycle.
Matthew Goode as young Anthony