A. 6.--When Constantius thus became Caesar of the West, his first task was to restore Britain to the Imperial system. He was already, it seems, connected with the island, and had married a British lady named Helen.[325] Their son Constantine, a youth of special promise (according to the panegyrists), had been born at York, about A.D. 274, and now appeared on the scene to aid his father's operations with supernatural speed, "_quasi divino quodam curriculo_."[326] Extraordinary celerity, indeed, marked all these operations. Allectus was on his guard, with one squadron at Boulogne to sweep the coast of Gaul, and another cruising in the Channel. By a sudden dash Constantius [in A.D. 296] seized the mouth of Boulogne harbour, threw a boom across it, "_defixis in aditu trabibus_," and effectually barred the pirates from access to the sea.[327] Meanwhile the fleet which he had been building simultaneously in various Gallic ports was able to rendezvous undisturbed at Havre. A. 7.--His men were no expert mariners like their adversaries; and, for this very reason, were ready, with their Caesar at their head, to put to sea in threatening weather, which made their better-skilled pilots hesitate. "What can we fear?" was the cry, "Caesar is with us." Dropping down the Seine with the tide on a wild and rainy morning, they set sail with a cross wind, probably from the north-east, a rare thing with ancient ships. As they neared the British coast the breeze sank to a dead calm, with a heavy mist lying on the waveless sea, in which the fleet found it impossible to keep together. One division, with Constantius himself on board, made their land-fall somewhere in the west, perhaps at Exeter, the other far to the east, possibly at Richborough.