In Anno 1404: Venice you sometime get quests that require you to destroy Corsair Ships. By that point however you are more often than not allied with the Corsairs which makes it impossible to attack their ships. Solution? Buy the Letters of Mark, which you can get ONLY from the Corsair leader, Hassan ben Sahid.
Your best friend and imperial advisor Lord Northburg fretfully complaining about how he has to look out his little window every few seconds, just to explain to the player that the hemp for the corderies is notthere for smoking.