Mediator characteristics have been found to affect both the process of getting warring parties to sign an agreement and how sustainable that agreement will turn out to be. Since the type of peace agreement also has been found to affect the sustainability of peace agreements, this study aims at examining whether the identity of the mediator is related to which type of agreement is being signed and to see if this could be an explaining factor to the previous results in this field. Many earlier studies have defined success in different ways, mainly either as the signing of an agreement or the durability of agreements. This study contributes to the research field by combining these two definitions. Since type of agreement has been shown to affect the durability of peace, factors that influence what type of agreement is signed will also affect how sustainable the agreement will be. Peace agreement sustainability is seen as the definition of success, but in the search for what makes an agreement last, you might have to look at what makes the parties sign the agreement in the first place. This will therefore develop the concept of successful mediation and analyze the two definitions as one. It is argued that international mediators will have a higher degree of comprehensive agreements compared to regional mediators and that this is the reason for why international mediators have been found to generate more durable peace. The results indicate that there is no difference between the two types of actors in terms of how much of the incompatibility is solved in the agreement, but when looking at how many parties are signatories, international and mixed mediators were correlated with a higher degree of comprehensiveness than regional mediators.