When George Bernard Shaw wrote 'My Fair Lady' he created the role of Eliza Doolittle specifically for which actress?

Eliza Doolittle is a fictional character from London who appears in the play 'Pygmalion' (George Bernard Shaw, 1912) and the musical version of that play, 'My Fair Lady'.

Eliza is a Cockney flower girl, who comes to Professor Henry Higgins asking for elocution lessons, after a chance encounter at Covent Garden. Higgins goes along with it for the purposes of a wager: That he can turn her into the toast of elite London society.

The part of Eliza was originally played by Mrs Patrick Campbell, at that time the most famous actress on London's West End stage. Shaw had written the role for her, and although many considered her too old for the role she triumphed. The unprecedented use of the word "bloody" (as a scripted intensive) caused a sensation when Campbell delivered it.