You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Szlachta

Context:
The tribes were ruled by clans (ród) consisting of people related by blood or marriage and theoretically descending from a common ancestor, giving the ród/clan a highly developed sense of solidarity. (See gens.) The starosta (or starszyna) had judicial and military power over the ród/clan, although this power was often exercised with an assembly of elders. Strongholds called grόd were built where the religious cult was powerful, where trials were conducted, and where clans gathered in the face of danger. The opole was the territory occupied by a single tribe. (Manteuffel 1982, p. 44)

Question:
What was the territory occupied by a single tribe?

opole