She was born on 7 March 1907, the daughter of Irish operatic baritone
Harry Plunket Greene and his wife
Gwendoline Maud Parry.
James Knox described her older brothers, Richard and David, as a "wildly irresponsible pair who had never experienced any form of parental control".
Evelyn Waugh was at Oxford with
David Plunket Greene and
Richard Plunket Greene, fell in love with Olivia Greene and became a constant of the family. Waugh described the three siblings as being "tinged […] with melancholy". Waugh wrote about his attraction to Olivia in
A Little Learning. According to Waugh, she was a tease who was available to everyone but him. It has been said that she is the model for the Honorable Agatha Runcible in
Vile Bodies. ==References==