swashbuckler -
A kind of period adventurestory with flashy action and lighthearted tone.
Wikipedia
Swashbuckler or swasher is a term that developed in the 16th century to describe rough, noisy and boastful swordsmen. It is based on a fighting style using a side-sword with a buckler in the off-hand, which was filled with much "swashing and making a noise on the buckler". Today the term "swashbuckler" has changed, and refers to both a type of fictional character and to a fiction genre, especially in the world of film and video games.