Rufus Castle, also known as Bow and Arrow Castle, is a ruined blockhouse overlooking Church Ope Cove on Portland, England. The castle dates from the late 15th century, possibly on the site of an earlier building (with origins dating from 1142) - making it Portland's oldest castle. Built on a pinnacle of rock, some of the original structure has been lost to erosion and collapse over the years.
The remaining castle appears to have been the keep of a stronghold, the foundation of which was much above the top of the church tower of St. Andrews which lay in the valley below. The pentagonal tower of the castle has late Medieval gunholes, but rests uncomfortably on an earlier foundation to the north and stepped plinth to the west which may have been a 12th-century keep. Remains include parts of the keep, sections of wall with gun ports and a 19th-century round-arched bridge across Church Ope Road.
The castle, including its bridge, has been a Grade I listed building since January 1951. It is one of three buildings on Portland to be Grade I Listed. In addition to this, the castle has become a scheduled monument under the Ancient Monuments and Archaeological Areas Act 1979.
Rufus Castle looks out over the Shambles sandbank, approximately three miles out to sea, one of the most feared navigational hazards in the area.
There is no public access to the castle as it is privately owned, though it can be seen well from public footpaths along the coast.
In ancient times for defence against attack, taxes were raised on the island to construct Portland's first castle. Rufus Castle was reportedly built for William II, although the structure seen standing in ruins today is not of that date. In 1142, Robert, Earl of Gloucester, had captured the castle from King Stephen on behalf of Empress Maud. It had additional fortifications added in 1238 by Richard de Clare who owned it at that time. Around 1256, Aylmer de Lusignan obtained a licence to crenellate the 'insulam de Portand' and Robert, Earl of Gloucester, was granted a similar licence just 14 months later. It is generally presumed that Rufus castle is the site of any work that may have resulted from these licences and any remains that may date from the period exist only at foundation level, or have been lost to cliff erosion.