Geraldine Somerville was born 19 May 1967 in County Meath, Ireland, the daughter of Sir Quentin Charles Agnew-Somerville, 2nd Baronet, and Margaret April Irene, Lady Agnew-Somerville (née Drummond), an antiques dealer, but was brought up on the Isle of Man. Somerville trained at the Guildhall School of Music and Drama and graduated in 1989. She did stage work and appeared on TV in episodes of Agatha Christie's Poirot and Casualty (1993) before landing the role of Penhaligon in Cracker, which she held from the show's inception in 1993 until its demise in 1995 and became one of the most memorable characters of the series. Somerville played Lady Stockbridge in Julian Fellowes's Gosford Park and Harry Potter's mother Lily in all the Potter movies.

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