Last time we saw Ibn Battuta through the Kingdom of Tlemcen, which at the time was at war with the Hafsids over control of the city of Béjaïa, or Bougie. Béjaïa is today a mid-sized city in north-central Algeria, but at the time it was the western capital of the Hafsid dynasty. Its site had been occupied at least since Carthaginian times, but gained in importance as a port city after the Arab conquests. It became the capital of the 11th-12th century Hammadid dynasty and retained much of that prominence under the Almohads and then the Hafsids. In the late 12th century, a young Pisan boy spent a good chunk of his youth in Béjaïa with his merchant father and became interested in mathematics. His name was Leonardo Fibonacci, and later on he would introduce Hindu-Arabic numerals as well as the concepts of zero and the decimal point to Europe. No big deal.