I want to know the answer to the following question:
Who previously held the keys to the Church of the Nativity?
All the background I'm provided with is that "Thus, France's show of force presented a real threat, and when combined with aggressive diplomacy and money, induced the Ottoman Sultan Abdülmecid I to accept a new treaty, confirming France and the Roman Catholic Church as the supreme Christian authority with control over the Roman Catholic holy places and possession of the keys to the Church of the Nativity, previously held by the Greek Orthodox Church.:20". Is that enough to answer the question?
Answer: yes