I had looked up some of the ancient Greek units (I had almost posted more information and a link to the Wikipedia article; but figured the truly curious would do the same search), and there is a listed unit that is within a few % of the modern customary pound.<p>It is very likely the translator did a simple substitution.  Given the interconnectedness of the Greek trading world, it&#x27;s likely that the unit variations were small to negligible in the eastern Mediterranean at that time; probably even less so that during the Renaissance when city-states were vying and fighting each other for commercial dominance.<p>Having read vol 1 of Braudel&#x27;s book on the Mediterranean world in the 16th c, units used in commerce varied widely in the 16th century (at least for shipping), and Braudel doesn&#x27;t even bother in most cases to translate them to modern units, he simply leaves them and compares magnitudes with a few asides to anchor the terms.