Right, but it's worth noting that's the opposite situation from road customs: it's much more believable because a significant portion of people traversing spira

Right, but it's worth noting that's the opposite situation from road customs: it's much more believable because a significant portion of people traversing spiral staircases in castles were carrying swords. EDIT: Having now read your linked article, I'll add that the spiral staircase story is more believable due to primary sources. :)