I want to know the answer to the following question:
When was he appointed Apostolic Delegate to Turkey and Greece?
All the background I'm provided with is that "Roncalli took up this post in 1935 and used his office to help the Jewish underground in saving thousands of refugees in Europe, leading some to consider him to be a Righteous Gentile (see Pope John XXIII and Judaism).". Is that enough to answer the question?