Altrossheim Proclamation
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The Altrossheim Proclamation was a territorial claim outlined by Mondo Etzeterra on 20.XIV.1706 AN. Inspired by the discovery of a historical map from the First Age of Treisenberg, Mondo laid claim to over a million square kilometres of central Cibola believed to have been ceded to his ancestor.
The Rossheim Map

Discovered in an archival collection of documents inherited from the Rossheim family, the Rossheim Map depicted the proposed partition of the first Treisenberg state into three principalities: Morovina, Rhaetia and Rossheim. Although it remains unclear whether the territorial division was ever implemented as shown on the map, the then Empire of Treisenberg-Slavonia was indeed briefly recast as a confederation named the United Principalities of Treisenberg, comprising three sovereign states with the same names as those depicted.