What was the most significant cultural invention of the Phoenicians?

The Phoenicians used the galley, a man-powered sailing vessel, and are credited with the invention of the bireme oared ship. They were famed in Classical Greece and Rome as “traders in purple,” which refers to their monopoly on the precious purple dye of the Murex snail, used for royal clothing, among other things

d. the right to establish a one-house legislature