Fitzwilliam P. Dalton III

Fitzwilliam P. Dalton was a young, well-bred aristocrat who surprisingly joined Jack Sparrow's crew at the beginning of his hunt for the Sword of Cortés. He became something of a rival for Jack onboard the Barnacle, often disagreeing with the captain.

Biography
Fitzwilliam hailed from a noble family, the Daltons. At the beginning of Jack's quest, Fitzwilliam fled his home in order to avoid an arranged marriage. Before Jack and Arabella Smith left Salty Cove, he insisted on coming with them, besting Jack in a sword fight to prove his worth. Dalton was with the crew when they visited the City of the Dead and defeated Captain Torrents.

When the Barnacle's crew fell under the sway of the Sirens, Dalton demanded that Jack take him to the nearest port, so he could join the Royal Navy and bring honor to the Dalton name. Eventually, Jack was forced to tie Dalton to the mast, and later negotiated with the mermaids to release his crew from their delusions.

Dalton continued his adventures with Jack. He helped him find the Sword of Cortés as well as the Sun-and-stars amulet.

Ironically at the end of a few adventures Fitz was the only one to remain with Jack. His pocketwatch was actually the Timekeeper, which Davy Jones strongly desires. Jack used the watch to save himself and Dalton. They went to a nearby island and were captured by unfriendly natives. Eventually, they escaped and discovered they were at the City of the Dead and have traveled back in time.

After traveling back in time, Chantico appeared to Fitzwilliam and Jack. She explained that their use of the Timekeeper has messed up time and gave them twelve hours to set time right. The two of them managed to find Tia Dalma who told them that the Timekeeper must be placed and removed from the grip of someone who doesn't belong to their time. Together, they managed to do this with Stone-Eyed Sam.

After the adventures with the Timekeeper were over, he revealed he is really a Royal Navy spy trying to find Teague, Jack's father. It is also revealed that he is the first cousin of James Norrington.