This only son of Selim the Grim had a navy commanded by Barbarossa.
This ruler had success against the Portuguese under his admiral Piri Reis, but failed to take the city of Diu. This ruler had his State Architect create the Sehzade Mosque. His forces won the Battles of Preveza and Djerba. He successfully besieged Esztergom as part of the Little War. This man had his admiral Turgut lay siege to Malta as part of an ongoing battle with a group he drove out of Rhodes, the Knights of St. John. He recognized John Zapolya as a vassal after the former Hungarian king, Louis II, drowned fleeing this man's forces in battle. This only son of Selim the Grim had a navy commanded by Barbarossa. He codified the legal system, so that his subjects called him "The Lawgiver". For 10 points, name this ruler who won at Mohacs and laid siege to Vienna, bringing the Ottoman Empire to the height of its power.
This ruler had success against the Portuguese under his admiral Piri Reis, but failed to take the city of Diu.
Suleiman I [or Suleiman the Magnificent or Süleyman Muhtesem; accept Suleiman the Lawgiver or Süleyman Kanuni early]