sentences:  Remains have been found of Roman roads, a bridge, a burial field, a harbor complex and even a Roman version of a dam in the river Maas suggesting that it was seen as a location of strategic importance on the North Western border of the Roman Empire.The more permanent foundation of "the Maasdam" around 1270 created a connection between the areas known as Poelwijk in the Tiesselijnswaard (north of the river) and Weede in the Grote Hollandse Waard (south of the river).The establishment of the Maasdam took place during the reign of Floris V. It was part of the establishment of the Grote Hollandse Waard which in itself was part of the long term policy of land reclamation by the Counts of Holland (since the reign of William I) who saw it as a way to strengthen their political and territorial powers in the region.