18. Theodora, second wife of Constantius I. (Chlorus, Cæsar, 293-305; Augustus, 305-6). 19. Licinius, Emperor (307-324). 20. Constantinus Emperor (306-337); (Constantine the Great). 21. Coin with head of Constantinopolis (City Deity)(_circ._ 330). 22. Constantinus II., Emperor (337-340). 23. Constantius II., Emperor (337-361). 24. Gratianus, Emperor (367-383). BRITISH COIN. 25. Antedrigus, British Prince (_circ._ 50). The figures in brackets in the following notes refer to the coins as numbered in the above list: (3) The Claudian invasion of Britain was begun in A.D. 43 by an army under the command of Aulus Plautius Silvanus. He led his army from the coast of Kent, where he probably landed, to the Thames, and waited for Claudius himself, in whose presence the advance to Camulodunum (Colchester) was made during the latter part of 43. Claudius apparently left Rome in July, and was absent for six months, but his stay in Britain is said to have lasted only sixteen days. In the pacification which occupied the next three years there are two points of interest to notice. The first is a series of minor campaigns conducted by Vespasian--Emperor 69-79--who subdued the Isle of Wight and penetrated from Hampshire, perhaps, to the Mendip Hills. The second is the submission of Prasutagus, the British philo-Roman prince of the Iceni. It is conjectured that his policy led a certain number of patriots under a rival prince, Antedrigus, to migrate towards the unoccupied west. A coin (25) of Antedrigus, with an extremely barbarous head in profile on the obverse and a horse on the reverse, was found on the Roman area at Aldington. The types of this coin are ultimately derived from those on the gold staters struck by Philip of Makedon, father of Alexander the Great. The original had a young male head (? of Apollo) on obverse and a two-horse chariot as reverse type. The influence came to Britain from Gaul, where the coins of Makedon may have arrived by the valleys of Danube and Rhine; but it is not improbable that the types reached Gaul through Massilia (Marseilles). In 47 Plautius was succeeded by P. Ostorius Scapula, who pressed westwards and fought a great battle with the nationalist army of Caratacus in 51. Camulodunum became a colonia in 50, and the military organization of Britain then began to take shape by the establishment of four legionary headquarters--Isca Silurum (Caerleon-on-Usk), Viroconium (Wroxeter), Deva (Chester) and Lindum (Lincoln). This disposition, which faced north and west, came near to breaking down in 61, when the east rose under Boudicca (Boadicea), queen of the Iceni, partly in protest against the usury of Seneca, the philosopher and tutor of Nero. (4) It was in the year 97, during the principate of Nerva, that Tacitus the historian was consul. By this time the IXth Hispana legion had been transferred from Lindum to Eburacum (York).