In its heyday from the 11th to the 13th centuries, Pisa created a powerful maritime empire down the Tyrrhenian coast and in Corsica, Sardinia, Sicily, Syria, Palestine, and Egypt.
The cities in Pisa's empire had very large populations of people.
mnli hypothesis: The cities in Pisa's empire had very large populations of people. premise: In its heyday from the 11th to the 13th centuries, Pisa created a powerful maritime empire down the Tyrrhenian coast and in Corsica, Sardinia, Sicily, Syria, Palestine, and Egypt.