On the Museum Boppard website, locate the 'Adlerstein' section. Explain its historical significance, including the year it was transferred and to whom, and describe what the 'Adlersteine' generally marked around Boppard.
Navigate to 'museum-boppard.de' Go to the 'Museumsrundgang' page. Under the 'Stadtgeschichte' section, click the 'Kurze Geschichte der Stadt Boppard' link. Locate the 'Adlerstein' section on the page. Extract the historical significance, the year of transfer, the recipient of the territory, and what the 'Adlersteine' generally marked.
State that the 'Adlersteine' marked the entire border around Boppard. Explain that they signify the transfer of the narrower 'Fiskus Boppard' (Boppard fiscal territory). Identify the year of transfer as 1312. Specify that the territory was transferred to the 'Trierer Erzbischof und Kurfürsten Balduin von Luxemburg' (Archbishop and Elector Balduin of Luxembourg of Trier).