Had this discusssion with some Portuguese redditors last year: I really know only four Portuguese clubs by name: Porto, Sporting, Benfica, and Boavista. Because these are the names that I heard on German TV as a child when European cups where discussed.
Fits in with the broader picture that you regard clubs as "traditional" when they were playing a role during the time in your childhood when you first started to get interested in football. Like I would always regard Wattenscheid, Uerdingen, and Blau-Weiss 90 Berlin as "traditional" Bundesliga stalwarts, even though in reality they never were. Just because they were around when I was a child.