Who or what -- like Worms is one of the oldest existing German cities (for example). A couple of facts about it -- It has been a cathedral city, diocesan seat, whatever, since the 4th century (or whenever). It was also the site of the [Diet of Worms]?, and therefore important in the Protestant Reformation BECAUSE...
Please note the BECAUSE -- if it's important enought ot write about, it's important enough to tell us why. JHK