[61] Camden mentions pearls being found in the counties of Caernarvon and Cumberland, and in the British sea. Mr. Pennant, in his "Tour in Scotland in 1769," takes notice of a considerable pearl fishery out of the fresh-water mussel, in the vicinity of Perth, from whence 10,000_l._ worth of pearls were sent to London from 1761 to 1764. It was, however, almost exhausted when he visited the country. See also the fourth volume of Mr. Pennant's Br. Zool. (Class vi. No. 18), where he gives a much more ample account of the British pearls. Origen, in his Comment. on Matthew, pp. 210, 211, gives a description of the British pearl, which, he says, was next in value to the Indian;--"Its surface is of a gold color, but it is cloudy, and less transparent than the Indian." Pliny speaks of the British unions as follows:--"It is certain that small and discolored ones are produced in Britain; since the deified Julius has given us to understand that the breastplate which he dedicated to Venus Genitrix, and placed in her temple, was made of British pearls."--ix. 35. [62] Caesar's two expeditions into Britain were in the years of Rome 699 and 700. He himself gives an account of them, and they are also mentioned by Strabo and Dio. [63] It was the wise policy of Augustus not to extend any further the limits of the empire; and with regard to Britain, in particular, he thought the conquest and preservation of it would be attended with more expense than it could repay. (Strabo, ii. 79, and iv. 138.) Tiberius, who always professed an entire deference for the maxims and injunctions of Augustus, in this instance, probably, was convinced of their propriety. [64] Caligula. [65] Claudius invaded Britain in the year of Rome 796, A.D. 43. [66] In the parish of Dinder, near Hereford, are yet remaining the vestiges of a Roman encampment, called Oyster-hill, as is supposed from this Ostorius. Camden's Britain, by Gibson, p. 580. [67] That of Camalodunum, now Colchester, or Maldon. [68] The Mona of Tacitus is the Isle of Anglesey, that of Caesar is the Isle of Man, called by Pliny Monapia. [69] The avarice of Catus Decidianus the procurator is mentioned as the cause by which the Britons were forced into this war, by Tacitus, Annal. xiv. 32. [70] Julius Classicianus, who succeeded Decidianus, was at variance with the governor, but was no less oppressive to the province. [71] By the slaughter of Varus. [72] The Rhine and Danube. [73] Boadicea, whose name is variously written Boudicea, Bonduca, Voadicea, &c., was queen of the Iceni, or people of Suffolk, Norfolk, Cambridgeshire, and Huntingdonshire. A particular account of this revolt is given in the Annals, xiv. 31, and seq. [74] Of Camalodunum. [75] This was in A.D. 61. According to Tac. Hist. i. 6, Petronius Turpilianus was put to death by Galba, A.D. 68. [76] The date of his arrival is uncertain. [77] He was sent to Britain by Vespasian, A.D. 69.