Captain Puff's Treasure Hunt

I am Polly the Parrot! For years I was held captive by smelly, stupid pirates as they sailed accross the ocean hopelessly searching for treasure. These pirates gave me the worst times of me life.
There were no crackers, and I was always seasick. I have made it my mission to seek revenge on all pirates for holding me captive! Those scallywags will never find any treasure ever again!
Now what about ye? Ye are the bravest traveler of all the Seven Seas? We will see about that!
If ye want to help your dirty ol' mates retrieve their map, ye must answer my five questions correctly.

First, which pirate is famous for his black flag with a skull and crossbones?