‘Wow, a dictator who taxed urine. (shhh, lets not give Ø any ideas...)’
Urine was an important raw ingredient for fullers as seen in answers.com about weaving:
‘Once the woolen cloth was woven, it passed into the hands of fullers who cleaned and softened it by dunking it in water that contained various kinds of detergents and soaps that dissolved or absorbed the fat that had been added to the wool before it was carded or combed. Lye, stale human urine, ashes, and fuller’s earth were commonly used. Fullers placed the folded cloth in a vat and trod on it with their feet, periodically removing and refolding the cloth so it would be evenly fulled.’
St. Paul was a tentmaker, which meant that he certainly worked with fullers, if he didn’t do this work himself,