There is some slight possibility that when Geoffrey tells us that Belinus made a wonderful structure at the quay called after him Billingsgate, he was not merely playing on the name of "some Saxon Billings," as has been said, for Belinus is recognised as the best known of the Celtic gods, and the name has been found in many inscriptions.[16] Geoffrey again tells us that Belinus constructed the great Roman roads in Britain, and we cannot be asked to suppose that the Roman roads were said to be the work of Belinus because the same Saxon Mr. Billings kept a posting-house.[17] The weight of evidence seems to allow of the view that there really were some remarkable Roman structures at the Tower and Billingsgate which tradition pointed to as the work of the Celtic culture-god Belinus, or of a king who bore his name. Some remnants of a building seem to have had the myth attached to them in the Middle Ages. Harrison, giving a version of the story, says of the Tower, "In times past I find this Belliny held his abode there, and thereunto extended the site of his palace in such wise that it extended over the Broken Wharf and came farther into the city, in so much that it approached near to Billingsgate, and as it is thought, some of the ruins of his house are yet extant, howbeit patched up and made warehouses, in that tract of ground in our times" (Holinshed). Belinus seems at times to have been confused with Cæsar, and so we get the Cæsar's Tower of Shakespeare and other writers. Stow, writing of the same "ruins," says, "The common people affirm Julius Cæsar to be the builder thereof, as also of the Tower itself." Nennius uses the name Belinus for Cassibelaunus, which latter, indeed, is evidently derived from the former; for he speaks of Belinus (Cassibelaunus) fighting against Cæsar. A parallel passage in Geoffrey gives Belinus the command of the army of Cassibelaunus, but in the account of the battle which follows we have no word of Belinus, but "Nennius," a brother of Cassibelaunus and Lud, takes his place and perishes from a blow of Cæsar's sword, _Crocea Mors_. "Nennius" was then buried at the North Gate of "Trinovantum" with the sword that had slain him.[18] All this is too confused to work out in detail, but it almost looks like a repeated echo of some legend which made Cassibelaunus fall in a _personal_ encounter with Cæsar. At bottom perhaps it may have been some inscription, or coin, lettered Cuno-belin, which associated the name of Belinus with a gate of London. Such coins have been found in London. We can only be certain that at the beginning of the twelfth century the existing name of the gate was explained by a Celtic word. [Illustration: FIG. 7.--COIN OF CLAUDIUS AND ANOTHER OF CONSTANTIUS, THE LATTER INSCRIBED LONDON (P.LON.). ENLARGED.]