Final answer:
Pacal the Great ordered the construction of a ten-mile dam around his capital.
Step-by-step explanation:
The leader who ordered the construction of a ten-mile dam around his capital was Pacal the Great. Pacal the Great was a Mayan ruler who reigned from 615 to 683 AD. He is most well-known for his architectural achievements, including the construction of the Temple of Inscriptions in the ancient city of Palenque, which is believed to house his tomb.