You know why the French public urinals are called Vespasians, don't you? Building massive amphitheatres costs a lot of money. The Emperor Vespasian, who was famously close with the money, imposed a pee-pee tax on Rome's public urinals (urine contains ammonia, which was used to launder woolen togas). When his son and heir Titus objected to this innovation in pub[l]ic finance, Vespasian held a coin under his nose and commented dryly, "Non olet." "It doesn't smell."
I didn't know they were called that or why, but do now. Thank you.