The first begins with the question "Who, if I cried out, would hear me among the angels' hierarchies," while the tenth and last imagines a young man who enters the land of Lament.
The fifth of them is dedicated to Frau Hertha Koenig, the eighth is dedicated to Rudolf Kassner, and they are collectively designated the property of Princess Marie von Thurn und Taxis-Hohenlohe.  The first begins with the question "Who, if I cried out, would hear me among the angels' hierarchies," while the tenth and last imagines a young man who enters the land of Lament. FTP, identify this group of poems, written between 1912 and 1922 and considered the masterwork of Ranier Maria Rilke.
The fifth of them is dedicated to Frau Hertha Koenig, the eighth is dedicated to Rudolf Kassner, and they are collectively designated the property of Princess Marie von Thurn und Taxis-Hohenlohe.  
the Duino Elegies