(hĕn'drək lou'rənszōn' spē'khəl) , 1549–1612, Dutch poet. In his cycle of spiritual songs Lieden Op't Vader Ons (modern ed. 1957), he was among the first to successfully adapt the iambic rhythms of French Renaissance verse and melody to Dutch usage. He propounded the iambic principle in Kort Begrijp des Redekavelings (1585). Spieghel was a leader of the Amsterdam circle that preceded the Golden Age of Dutch literature, and as poet-philosopher he exerted an important influence on Pieter Corneliszoon Hooft.