The original settlement (1629) by Richard Vines was brought under the control of Massachusetts and incorporated as Cape Porpus in 1653. It was reincorporated as Arundel in 1717 and was renamed Kennebunkport in 1821.
Links:
The Kennebunkport Historical Society Website
History of Kennebunkport Maine
History of the Kennebunks
The Saga of Captain Fairfield "A Mystery of the Seas"
Arundel & Kennebunkport ME aka Cape Porpus
The Brick Store Museum
Goat Island Light