Read this and answer the question. If the question is unanswerable, say "unanswerable".

Some możni (Magnates) descending from past tribal dynasties regarded themselves as co-proprietors of Piast realms, even though the Piasts attempted to deprive them of their independence. These możni (Magnates) constantly sought to undermine princely authority.:75, 76 In Gall Anonym's chronicle, there is noted the nobility's alarm when the Palatine Sieciech "elevated those of a lower class over those who were noble born" entrusting them with state offices. (Manteuffel 1982, p. 149)

Who constantly sought to undermine princely authority?
możni