Thus we see that the English kings were elected by the assembly of the nation; and they went through some form of election, perfunctory though it was no doubt, even in times subsequent to the Norman conquest. We have already mentioned that the institution of kingship was subsequent to the invasion of Britain, and was due to the immense amount of territory that fell to the disposal of the victorious general and the accession of importance he assumed thereby. The king was the chief magistrate in peace, and the leader of the national host (_fyrd_) in war; and the introduction of Christianity invested him with new attributes of sanctity. Still, it is important to notice that the idea of treason, and the penalty of death attached to it, was of late development. The penalty for killing a king is only a higher _wergild_ than in the case of an ordinary individual. The difference between class and class becomes more sharply defined after the invasion of Britain than before it. The bodyguard of the king (_comitatus_ or _gesith_) is more distinctly dependent upon him. They are known as his servants, or _thegns_. As regards the bulk of the people they form, however, a noble class. There were king's thegns and lesser thegns; the distinction being apparently regulated by the amount of land which they possessed. It was possible, however, for men who were not owners of land, to rise to the rank of thegn. Thus Athelstan decreed that a merchant who made three long sea voyages on his own account should be entitled to the quality of thegn. The classes of _ceorls_, or freedmen, and _laets_, landless men who cultivated the soil for their lords, continued to exist; but there was also a class of absolute slaves usually occupied in household labour, whose position must have been most unenviable. The power of the master over his slave, however, was not unlimited, for if he beat his eyes or his teeth out, the latter might claim his liberty; and if he killed him, he paid a fine to the king, provided the slave died within a day after receiving his wound.