 "Aufstieg und Niedergang der römischen Welt", for example, began in 1972 as a "Festschrift" to commemorate the 75th birthday of Joseph Vogt, a German classical historian.Four volumes were planned, but it has since reached 89 volumes (including several which were planned for the next years, but put on hold in 1998).The essays usually relate in some way to, or reflect upon, the honoree's contributions to their scholarly field, but can include important original research by the authors.