Regulbium was the name of an ancient Roman fort of the Saxon Shore in the vicinity of the modern English resort of Reculver in Kent.

The first Roman military installation in the area was a small fort built directly after the invasion of Britain in the reign of Claudius, protected by earthworks.

The fort, strategically located at the entrance of the Wantsum Channel, possibly housed a signal tower, perhaps a lighthouse, and continued in operation at least until the late 60s, since coins dating to the reign of Nero were found on site.

[1] This construction occurred at a time when cities and strategic sites all over Western Europe were fortified in response to the greater threat posed by barbarian raids.

[6] After the arrival of the Anglo-Saxons in Britain, the site continued to be inhabited, and, now called Raculf, became a residence of the Kings of Kent.