Jan van Eyck | Jan Matejko Academy of Fine Arts | Jan Hammer | Jan Peerce | Jan Hus | Jan Mayen | Jan Guillou | Jan Smuts | Jan Fabre | Jan Morris | Jan Matejko | Jan Garbarek | Ignacy Jan Paderewski | Jan van Riebeeck | Jan Troell | Wolfgang Petersen | Jan Tinbergen | Jan Neruda | Jan-Michael Vincent | Jan Kochanowski | William Petersen | Jan Brewer | Jan Bechtum | Sandy Petersen | Jan Zamoyski | Jan Ullrich | Jan Peter Balkenende | Jan Egeland | Robert Jan Stips | Petersen Quartet |
The system is a continuation of Jan Petersen's typology of the Viking sword, introduced in De Norske Vikingsverd ("The Norwegian Viking Swords", 1919), modified in 1927 by R. E. M. Wheeler into a typology of nine types labelled I to IX.