This is the 15240th most frequent German word.
umkämpften
"Umkämpften" means "contested" or "fought over."
In this sentence, 'umkämpften' is used as an adjective describing areas ('Gebiete') that are actively contested or fought over.
Die umkämpften Gebiete wurden von Gegnern beschossen.
The contested areas were shelled by opponents.
Here, 'umkämpften' is used as an adjective to qualify the debate ('Debatte'), indicating it was a vigorous or contentious discussion.
Er verteidigte seine Position in der umkämpften Debatte.
He defended his position in the contested debate.
In this instance, 'umkämpften' characterizes a princedom ('Prinzenreich') as one that is the subject of struggles or battles.