Question:  Katherine Stanhope, Countess of Chesterfield was the governess and confidante of this Princess who was married to who 
Sentence (from "Philip Stanhope (diplomat)"): Philip Stanhope (2 May 1732 – 16 November 1768) was the illegitimate son of Philip Stanhope, 4th Earl of Chesterfield to whom the famous "Letters to His Son" were addressed.
Relevant evidence: No