In turning from the ecclesiastical to the secular annals of the diocese, the barons of the Côtentin scarcely occupy a less distinguished place. The histories of the Crusades, in particular, abound with their exploits. Hauteville, near Coutances, boasts to have given birth and title to Tancred, of immortal memory; who, either himself, or by his descendants, founded the kingdoms of Naples and Sicily, and reigned over almost the whole of Italy; while, with their victorious forces, they exterminated the Saracens, protected the holy see, supported the Cretans in the east, and carried their conquering arms to the utmost confines of the Greek empire. To them, also, the chivalrous institution of the Golden Fleece owes its origin; and so extraordinary were their exploits, that they might pass for fabulous, had they occurred in a more remote age, and did not the concurring testimony of historians unite to stamp them with the seal of truth. According to the ecclesiastical division of France before the revolution, the diocese of Coutances was bounded to the south by that of Avranches, and to the east by that of Bayeux, while, in the two remaining divisions, its limits were circumscribed by the ocean.[205] At present, it includes the whole department of La Manche; the suppression of the bishopric of Avranches having added considerably to its extent.--In Roman Gaul, Coutances was included in the province called the _Lugdunensis secunda_: but, on the subject of the foundation or early history of the city, authors are, as commonly happens, much at variance, ascribing to it, according to their fancies or their prejudices, very different degrees of antiquity. Those who are most disposed to do it honor in this respect, contend that it was the capital of the tribe mentioned by Cæsar, in his _Commentaries_, under the name of _Unelli_; and called by Pliny, _Venelli_; and by Ptolemy, _Veneli_. They are guided in this opinion exclusively by locality. Others, with a greater appearance of probability, at least as far as any reliance may be placed upon etymology, maintain that Coutances had no existence before the days of the Emperor, Constantius Chlorus, father to Constantine the Great. There have also not been wanting writers who have referred its origin to Constantine himself, or who have maintained that it was indebted for its name to its _constant_ and vigorous opposition to the Roman power. The second of these opinions appears to have obtained general credence in the time of Ordericus Vitalis, who, in speaking of Constantius, expressly says, "Hic in Neustriâ civitatem condidit, quam a nomine suo _Constantiam_ nominavit." Ammianus Marcellinus adds strength to the same belief, when he calls Coutances, _Constantia castra_. It is probable that the city was in reality the seat of the Emperor's camp, at the time when he was about to lead his forces into Britain.