North of Essex it was no longer the Saxons who took up the task of conquest, but a kindred tribe, the Angles or English, who dwelt originally between the Saxons and the Jutes, in the district which is now called Schleswig. They were closely allied in blood and language to the earlier invaders of Britain, and very probably their chiefs may have aided in the earlier raids. About the year 520 the Angles descended in force on the eastern shore of Britain, and two of their war-bands established themselves in the land where the Celtic tribe of the Iceni had dwelt. These two bands called themselves the North Folk and South Folk, and from them the counties of Norfolk and Suffolk get their names. The kingdom formed by their union was known as that of the East Angles. [Sidenote: =The Northumbrian kingdoms, 547-550.=] Still further to the north new Anglian bands seized on the lands north of the Humber, whence they obtained the name of Northumbrians. They built up two kingdoms in the old region of the Brigantes. One, from Forth to Tees, was called Bernicia, from Bryneich, the old Celtic name of the district. It comprised only a strip along the shore, reaching no further inland than the forest of Selkirk and the head-waters of the Tyne; its central stronghold was the sea-girt rock of Bamborough. The second Northumbrian kingdom was called Deira, a name derived, like that of Bernicia, from the former Celtic appellation of the land. Deira comprised the North and East Ridings of Yorkshire, and centred round the old Roman city of Eboracum, whose name the Angles corrupted into Eofervic. The origin of Bernicia and Deira is ascribed to the years 547-550, so that northern Britain was not subdued by the invaders till a century after Kent had fallen into their hands. [Sidenote: =The kingdom of Mercia.=] Last of the English realms was established the great midland state of Mercia--the "March" or borderland. It was formed by the combination of three or four Anglian war-bands, who must have cut their way into the heart of Britain up the line of the Trent. Among these bodies of adventurers were the Lindiswaras--the troop who had won the old Roman city of Lindum, or Lincoln,--the Mid-Angles of Leicester, and the Mercians strictly so-called, who held the foremost line of advance against the Celts in the modern counties of Derby and Stafford. The Britons still maintained themselves at Deva and Uriconium (Chester and Wroxeter), two ancient Roman strongholds, and the Mercians had not yet reached the Severn at any point. [Sidenote: =The Britons in the west.=]