Which actress won an Oscar for playing Queen Elizabeth II in 'The Queen'?

Which actor won an Oscar for playing King George VI in 'The King's Speech'? Which actor won an Oscar for playing Ray Charles in 'Ray'? Which actor won an Oscar for playing Idi Amin in 'The Last King of Scotland'? Which actor won an Oscar for playing Winston Churchill in 'Darkest Hour'? Which actress won an Oscar for playing Queen Anne in 'The Favourite'? Which actress won an Oscar for playing Erin Brockovich? Which actress won an Oscar for 'Million Dollar Baby'? Which actress won an Oscar for 'Monster' (2003)?