Why Is Frankfurt's Kaiserdom Not Actually a Cathedral?
Because a cathedral, technically, requires a bishop's seat, and the Kaiserdom never had one, its name, Imperial Cathedral, comes instead from its genuine historical role: the 1356 Golden Bull made Frankfurt the official site for electing Holy Roman Emperors, and starting with Maximilian II in 1562, actual coronations were held here too, continuing until 1792. Entry to the main nave is free. Climbing the 95-meter Gothic tower via 328 steps costs €8 for adults, €4 for youth and students, and €20 for families. The Romerberg square beside it, home to the Romer city hall in continuous use since 1405, is free and open 24 hours a day.
Why "Kaiserdom" describes a function, not a formal cathedral status
The building's name, Kaiserdom, translates to Imperial Cathedral, but that title reflects its historical function rather than its formal ecclesiastical status, since a true cathedral by definition requires a bishop's seat, which this church has never had. Its genuine significance comes from serving as the election and, later, coronation church of the Holy Roman Emperors, a genuinely distinct kind of historical importance from a typical bishop's cathedral elsewhere in Europe.
Why the 1356 election date and the coronation dates are two separate facts
The 1356 Golden Bull made Frankfurt the official, binding site for electing Holy Roman Emperors, but actual coronations didn't move here until 1562, with Maximilian II, and continued until the last one in 1792, a 230-year span rather than the longer period the 1356 election date alone might suggest. Before 1562, coronations were typically held in Aachen. That distinction, election site since 1356 versus coronation site from 1562, is worth understanding as two genuinely separate, checkable milestones rather than one continuous 436-year coronation history.
Why the tower climb is a genuine, separate physical commitment
Climbing the cathedral's 95-meter Gothic tower means 328 steps, a genuine physical undertaking distinct from simply visiting the free main nave. That's worth factoring into who the climb makes sense for, and worth budgeting genuine time for beyond a quick nave visit, given the tower's height and the number of steps involved.
Why the Römerberg square works as a natural extension of a cathedral visit
Just beside the Kaiserdom, the Römerberg square has functioned as Frankfurt's civic gathering place for over 600 years, home to the Römer city hall, in continuous administrative use since 1405, and the 1543 Fountain of Justice. Because the square itself is free and open 24 hours, pairing a Kaiserdom visit with a walk through the Römerberg costs nothing beyond whatever tower or Kaisersaal fees are chosen separately.
What This Means for Visiting the Kaiserdom and Römerberg
The practical takeaway is that a meaningful Frankfurt old-town visit costs very little if the goal is the main cathedral nave and the historic square, both are free, with the tower climb and the Kaisersaal's portraits of 52 Holy Roman Emperors as optional paid additions worth choosing based on genuine interest rather than assumed as mandatory costs. Given the genuine, two-part history behind the Kaiserdom's name, election site since 1356 and coronation site from 1562 to 1792, treating it as a serious historical site rather than a passing photo stop reflects what the building actually represents.