You're probably not the same way, but you might find these University of Penn articles interesting as to how the ancients collected taxes. You'll probably be stunned to find out, as I was, that they had a similar tax rate as we do now. How do I know this?
Many times they paid in livestock so a straight conversion isn't realistic, but if you look at how they often had to work for 3 months for the state it's not much different than ours. We usually work anywhere from 1-5 months in taxes depending upon whether you want to include local taxes and what tax bracket you're in. The more things change the more they stay the same...