I remember that in Star Trek (maybe Voyager?) a species was proud of having been conquered many times in their history.
What is the name of the species?
The Mizarians. Picard encounters one when he's kidnapped by aliens in TNG: Allegiance
PICARD: None? In the last three hundred years of Mizarian history, your planet has been conquered six times!
THOLL: And we've survived by not resisting. Mizarians value peace above confrontation.
Planet: Mizar II. A highly intelligent and pacifistic race, so opposed to confrontation they have let themselves be conquered six times in the last 300 years. Humanoid in appearance but with whitish facial skin sharply folded along vertical lines.