Mary Isobel Downer, Lady Downer (13 December 1924 – 14 October 2014) was a prominent South Australian patron, wife of federal MP and high commissioner Sir Alexander "Alick" Downer, and mother of Liberal Party leader, Australian Foreign Minister and high commissioner Alexander Downer.
Lady Downer was a prominent South Austrailian patron in the 1900s.
This is correct because she was born in 1924, which would have made her a patron in the 1900s.