Editing Clan McDuck (section)

=== Swamphole McDuck ===
'''Sir Swamphole McDuck''' (1190-1260)<ref>Sir Swamphole McDuck's life span is seen on his grave stone as 1161-1221 in the Carl Barks painting ''Dubious Doings at Dismal Downs''.</ref> succeeded his father, Roast McDuck, as clan chief and inherited its financial problems. In 1220, Swamphole sealed the dungeon of Castle McDuck, which he claimed was an attempt to decrease maintenance costs. He did, however, create secret passageways in the castle leading to the dungeons. (These passageways would later be useful during subsequent sieges.) After his death in 1260, Swamphole was not buried in the clan cemetery; rather, his skeleton was placed inside his memorial suit of armor, which was placed in Castle McDuck. Swamphole McDuck is first mentioned in ''The Old Castle's Secret'' by Carl Barks.<ref name="castle"/> In ''[[The Old Castle's Other Secret or A Letter from Home]]'' (2004) by Don Rosa, it is revealed that Swamphole sealed the dungeons not to reduce maintenance costs, but to conceal a treasure.

In the [[DuckTales (2017 TV series)|2017 ''DuckTales'' series]] episode, "The Secret(s) of Castle McDuck!", he is stated to be a treasure hunter (like Scrooge) who constructed secret passageways underneath Castle McDuck and let loose a demon dog to protect his treasure. His ghost later appears to ward off said demon dog alongside the ghosts of several of his family members.