 Early Egyptian rulers based on units of fingers, palms and feet based on inscription grids that incorporated standards of measure as canons of proportion were made commensurate with Mesopotamian standards based on fingers, hands and feet so that four palms or three hands equaled one foot and ten hands equaled one meter.These standards which were used to measure and define property such as buildings and fields were adopted by the Greeks, Romans and Persians as legal standards and became the basis of European standards of measure.They were also used to relate length to area with units such as the khet, setat and aroura, area to volume with units such as the artaba and space to time with units such as the Egyptian minute of march, the itrw which recorded an hours travel on a river, and the days sail.