The idea of ​​emerging international organizations was initially originated by the Greek state, and was envisioned by European writers such as Pierre Dubois and Emeric Cros, but it did not appear publicly until the nineteenth century. At the end of the French Revolution in the late eighteenth century and the beginning of the nineteenth century, European leaders met periodically, to preserve their positions and protect their governments from internal rebellion. After that time, many international organizations were established, such as the International Telegraph Union in 1865 AD, and several years later, European and non-European countries met. European meetings to establish rules for organizing and managing war situations resulted in the Hague Conventions. These various meetings and agreements were an introduction to international organizations in the twentieth century, such as the League of Nations and the United Nations, after which the United Nations became the focus of all international organizations.