On March 17th 2011, the United Nations Security Council passed Resolution 1973 that paved the way for the NATO-led military operation in Libya. It was the first time a resolution authorized the use of force against a functioning government in order to protect civilians. It was also arguably the first time the doctrine of“ Responsibility to Protect” (R2P) was alluded to in the text of a resolution of the Security Council. This paper seeks to understand the importance of the Libyan crisis in the development of R2P as an international norm and its potential future. Using a framework developed by Finnemore & Sikkink about the evolution of international norms, we assess the development of R2P before the Libyan crisis. We then establish the importance of the Libyan crisis in the evolution of R2P and look at the declarations made by the representatives of the Security Council member states after they had voted for Resolution 1973, and use them to show that the language and principles of R2P permeated much of the discussions about the Resolution. We finally focus on the backlash of the NATO-led military operation in Libya and its effect on the evolution of R2P with the examination of the“ Responsibility while Protecting” proposal and what that might mean for the future of R2P.