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 <answer>grόd</answer> 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)
What were stronghold called?
grόd