In this regard, immunity was guaranteed multilaterally to assure the credibility and authenticity of the information delivered by the envoys. In other words, the immunity granted to the diplomats and envoys aimed at making the diplomatic crew feel comfortable so that they would not manipulate the message to be delivered in order to guarantee their own security. This diplomatic custom was later institutionalized and legalized in 1961 Vienna Convention on Diplomatic Relations, yet it remained as a respected principle mainly after the middle 17th century.