The Mediterranean between the 1500s and the 1900s is a very interesting place with a lot of interesting shades of gray. For example: https://en.wikipedia.org/wiki/Sinan_Reis

> Sinan sailed under the famed Ottoman admiral Hayreddin Barbarossa at the 1538 Battle of Preveza against Charles' Imperial fleet and its commander, Andrea Doria. Sinan suggested landing troops at Actium on the Gulf of Arta near Preveza, an idea which Barbarossa initially opposed, but which later proved to be important for securing the Ottoman victory.

> Around 1540, Sinan's son was traveling by sea to meet him after one of Sinan's victories. The boy was taken captive by Emperor Charles' forces and was ultimately handed over to the Lord of Elba, who baptized him and raised him at court. Barbarossa made several unsuccessful attempts to ransom Sinan's son. While sailing nearby in 1544, Barbarossa sent an envoy to Elba to again attempt to free the boy. The island's Lord replied that his "religious scruples forbade him to surrender a baptized Christian to an infidel". Infuriated, Barbarossa landed men at Piombino, sacked the town, and blew up the fort, after which the ruler agreed to release his "boy-favorite".