CHAPTER II.
THE VARIOUS ROMAN YOKES: THEIR GROWTH, DEGENERATION,
AND FINAL ELIMINATION.
AGRICOLA no doubt made the Roman yoke easier upon the necks of the conquered people, and suggested the rotation of crops. He also invaded Caledonia and captured quite a number of Scotchmen, whom he took home and domesticated.
Afterwards, in 121 A.D., the emperor Hadrian was compelled to build a wall to keep out the still unconquered Caledonians. This is called the "Picts' Wall," and a portion of it still exists. Later, in 208 A.D., Severus built a solid wall of stone along this line, and for seventy years there was peace between the two nations.
Towards the end of the third century Carausius, who was appointed to the thankless task of destroying the Saxon pirates, shook off his allegiance to the emperor Diocletian, joined the pirates and turned out Diocletian, usurping the business management of Britain for some years. But, alas! he was soon assassinated by one of
