[s5e6] Episode #5.6 -

November 2, 2014 (UK) / February 8, 2015 (US). IMDb Key Plot Points:

Violet (Maggie Smith) reveals the truth about her past with Prince Kuragin to Isobel Crawley. [S5E6] Episode #5.6

Original Air Date: May 17, 2015. Wikipedia Key Plot Points: November 2, 2014 (UK) / February 8, 2015 (US)