Gideon Walker was one of the several early settlers of Kennebunkport (then named Arundel) who were enslavers.

"A few of the inhabitants of Arundel were able to hold slaves. Mr. Prentice bought the first one owned in town, in 1734. Mr. Hovey also owned one, and probably sold him in 1747. Robert Cleaves, Thomas Wiswall, Samuel Hutchins, John Fairfield, Gideon Walker, Andrew Brown, and Jonathan Stone each owned a slave. Several of them were living in the town, but a few years since, the last two of whom died in the poor house, or which the son of the former master of one of them was an inmate." - Bradbury, p. 158

"Paul Shackford ... is credited with building in 1740 the first house in what would become the center of the river village...Shackford's only near neighbor in 1740 would have been Gideon Walker, a tanner, who came from Kittery that year. Walker first built a small house and in 1745 a larger house next to it [on what is now South Street] on the high point of land that ran down to the river." - Butler, p. 30 Thus, Walker built the second house in the village of Kennebunkport.

There is no mention of slaves or servants in the 1743 will of his father, John Walker of Kittery, who left his son Gideon 20 acres in "Arundel"

Gideon Walker's 1745 house still stands at what is now 8 South St. in Kennebunkport

Bibliography:

History of Kennebunk Port from its First Discovery (1602-1837) - Charles Bradbury

Kennebunkport - The Evolution of an American Town (Volume I - 1603-1923) - Joyce Butler

Buildings of New England - Gideon Walker Farmhouse - https://buildingsofnewengland.com/2020/07/07/gideon-walker-farmhouse-1745/

Gideon Walker's Family Search entry: https://ancestors.familysearch.org/en/LZ8T-SQH/gideon-walker-1719-1805