Abstract ? From the mandate in the Roman law to the mandate of the ABGB §§ 1002This thesis deals with the development of the mandate, starting with its origins within the old-roman law and the regulations concerning the mandatum, stretching over the classic and the German medieval, up to the nature-law codifications in Austria and the current law.The mandate is a legal institution, which exists still the early beginnings of law and which was consulted to conduct transactions (be it purely factual or legal nature). The development starts with the regulations concerning the mandatum within the old Roman empire. This definition depends most of all on the characteristics of non-remuneration and the foreign interest. The terms amicitia and honorar/merces have a special role and will be dealt with in more detail within their respective linkages and referring to their relevance for the mandatum. The next important step within the development of the mandate can be found within the Justinian epoch, in which monetary order were first accepted. After describing the further development within the classic and post-classic era, the mandate is examined in the German medieval law. A special focus is on the changes concerning the characteristics of orders, as well as the diverse differences between the general Prussian country law and the Bavarian codifications. The sixth chapter deals with the juridical development in Austria, starting from the origins of the ABGB and the codex theresianus up to the drafts of Horten and Martini, whereas especially the latter one has entices changes of the codex theresianus. Eventually, the ordering system in the AGBG is analysed with a specific focus on the differentiation between order/mandate. A description of the mandate within the German BGB is followed by a final comparison between the respective regulations and an examination of the major differences.