A town of Portugal, in the district of Santarem, 19 m. N.N.E. of Santarem on the Lisbon-Entroncamento railway. Pop. (1900), 10,746. It manufactures cottons, linens, jute, paper, leather and spirits. It was probably founded by Greeks, and was held by the Romans, Goths and Moors, from whom it was conquered in 1148 by Alphonso I. of Portugal.