Where did our modern interpretation of the 18th century pirate’s accent come from?

by tnick771

Y’arr. How did we come to our modern interpretations of a pirate’s accent from approximately 300 years ago. The high-pitched, growly accent with a right Scottish-sounding brogue.

Is it something early Hollywood dreamt up, or do we know how the swashbucklers of yore actually spoke?

SepehrNS