The authority of the Roman king was called Emperor, it reflects his taking of the title Augustus or Caesar. Another title often used was imperator, originally a military honorific. Early Emperors often used the term princeps (first citizen). I'm pretty sure I gave the correct answer if you asked what was the term was for Roman King.
<span>The
economist Julian Simon bet in 1980 that the prices of five free traded
commodities would decline in ten years. In 1990 Simon won this bet against
the neo-Malthusian Paul Ehrlich.</span>