Villages were protected by stockades or earthworks against the attacks of enemies and wild beasts, or they contained strongholds. They were governed by headsmen, who were, no doubt, military leaders also; disputes were settled by a judge. Land, especially grazing land, appears to have been held in common by communities, but there are indications that cultivated plots and houses were owned by families and ultimately by individuals, the father in such cases being the supreme authority. Village communities, however, might be migratory, and certain of them may have had seasonal areas of settlement. Permanent villages existed in groups and also at some distance from one another, and were connected by roads, and one clan might embrace several separate communities. Trade was conducted by barter, the cow being the standard of value, but in time jewels and gold ornaments were used like money for purchases; “nishka”, a necklet, afterwards signified a coin. Foreign traders were not unknown at an early period. The use of alphabetic signs appears to have been introduced by Semites before the close of the Vedic period; from these evolved ultimately the scientific Sanskrit alphabet and grammar. In the Iranian period[128] there were social divisions of the people, but the hereditary system does not appear to have obtained until the close of Rigvedic times. Kings might be elected, or a military aristocracy might impose its sway over an area; a priest was originally a poet or leader of thought, or a man of elevated character, like the Scottish Highland _duine-usual_, the “upwardly man”, who might be the son of a chief or of the humblest member of a community. [128] A convenient term as explained in our Introduction.