Pretty much the most piratey of all the pirates in the first movie as portrayed by Geoffrey Rush. Rush's performance was so perfect Disney sought had to resurrect Barbosa and give him a prominent role in the third movie. He appears in all five of the Caribbean films.
This is actually a recurring phenomenon in pirate cinema starting with Long John Silver (1954) because Robert Newton nailed the character so hard in Treasure Island (1950) that Disney decided he was worthy of an encore. Newton's performance informs the common pirate dialect as we know it today the way modern depictions of Dracula (and sometimes vampires in general) take cues from Bela Lugosi's performance. Rush, in preparation for POTC1 studied Newton's performance, to grand effect.
International Talk Like a Pirate Day, celebrated every year worldwide, rose from silly parody holiday to global celebration with pirate parades, drinking festivals and carousing competitions, with much thanks to the Reformed Church of the Flying Spaghetti Monster it its ongoing efforts to reduce global warming. In the mid 2010s the ITLPD Commission adopted the Silver Standard establishing Newton's depiction of Silver as the codefied ideal by which piratey dialog is to be conducted.