Roose Hundred, Medieval administrative district in Pembrokeshire, Wales

Roose Hundred is a medieval administrative district in Pembrokeshire, Wales, covering a large stretch of coastal land. The territory is bordered by the Western Cleddau river, Milford Haven port, and St Brides Bay, with numerous villages and farmland within its boundaries.

The area was originally the Welsh cantref of Rhos, but the Laws of 1535-1542 converted it into an official English administrative hundred in Pembrokeshire. This transformation was part of the administrative reforms that brought Wales under English control.

This region became English-speaking after Norman settlers arrived in the 12th century, setting it apart from surrounding Welsh areas. The settlement patterns and place names still show this blend of English and Welsh influences today.

The territory is no longer an active administrative center, but individual towns like Haverfordwest serve as starting points for exploring the region. Visitors can discover the villages, river landscapes, and coastal features along the historical boundaries at their own pace.

The name comes from the Welsh word Rhos, referring to the area being almost entirely surrounded by water bodies like rivers and bays. This natural isolation shaped how the territory developed over many centuries.