citadel of Batavia, whose foundation is seen at low water, near the old mouth of the middle Rhine: some imagine it the pharos or high tower of Caligula, as Suetonius calls it; a monument of Caligula's sham conquest of Britain. Others that it was built by Drusus, with an altar afterwards by Claudius, on his expedition into Britain. But the usual passage was from Geissriacum; and Suetonius expressly says, Claudius passed over thence. The ancient name of this citadel, now covered by the sea, is nowhere expressed: Now commonly called 't Huis Britten, or Brittenburg; that is, Arx Britannica; but from what authority does not appear.