Three large monoliths called Harold's Stones are located in a field on the eastern side of the B4293 to the south of Trellech. The stones are on slightly elevated ground close to running water and springs, which might be relevant to the choice of site. They are believed to date back to the Bronze Age. Such remains are rare in this part of Wales. They derive their name from a legend that they mark the spot at which three chieftains fell in battle with Harold Godwinson, who defeated the Welsh in Gwent in 1063. In another legend the stones were flung from Skirrid by the mythical Jack o' Kent in a competition with the Devil.
References:Trenčín Castle is relatively large renovated castle, towering on a steep limestone cliff directly above the city of Trenčín. It is a dominant feature not only of Trenčín, but also of the entire Považie region. The castle is a national monument.
History of the castle cliff dates back to the Roman Empire, what is proved by the inscription on the castle cliff proclaiming the victory of Roman legion against Germans in the year 179.
Today’s castle was probably built on the hill-fort. The first proven building on the hill was the Great Moravian rotunda from the 9th century and later there was a stone residential tower, which served to protect the Kingdom of Hungary and the western border. In the late 13th century the castle became a property of Palatine Matúš Csák, who became Mr. of Váh and Tatras.
Matúš Csák of Trenčín built a tower, still known as Matthew’s, which is a dominant determinant of the whole building.