NEWGATE (The), a rivulet of Pembroke; rising near Llanreithan; running 5 miles southward and 2½ west-ward to St. Bride's bay, 6½ miles E S E of St. David's; tracing the boundary between the hundreds of Rhos and Dewisland; and traversing at its mouth, at low water, a large breadth of sands. Tradition says that a forest oncegrew on the site of these sands; and Giraldus Cambrensis speaks of the place as having trunks of trees standing in the midst of the sea with very black earth and severalold blocks like ebony, so that it did not appear like the sea-shore, but rather resembled a grove.

(John Marius Wilson, Imperial Gazetteer of England and Wales (1870-72))