Galleass based on galley
A galleass was a type of warship - a hybrid that combined the sails and armament of a galleon with the maneuverability of the oared galley. While never quite matching up to the  full expectations for its design, the galleass nevertheless remained in use during the 16th and 17th centuries.Development
Galleasses were higher, larger and slower than regular galleys. They had up to 32 oars, each worked by up to five men. They usually had three masts, and unlike galleys, proper forecastles and an aftcastles. Much effort was made in Venice to make galleasses as fast as possible to compete with regular galleys. The gun deck usually ran over the rowers' heads, but there are also pictures showing the opposite arrangement. Galleasses usually carried more sails than galleys and had far more firepower; a galley caught in a galleasses broadside was in great danger, since it exposed to a large amount of gunfire. Relatively few galleasses were built—one disadvantage was that, being more reliant on sails, their position at the front of the galley line at the start of a battle could not be guaranteed.