Topic summary
Emperor Otto IV
Extracted from the Wikipedia article Otto IV, Holy Roman Emperor.
External links
- Literatur zu Otto IV. in the German National Library catalogue
- Werke über Otto IV, Holy Roman Emperor in the Deutsche Digitale Bibliothek (German Digital Library)
- Literature about Otto IV in the OPAC of the Regesta Imperii
- Kaiserstadt Braunschweig – Otto IV
- Deed by Otto IV for Salem Abbey, 14 July 1209, "digitalised image". Photograph Archive of Old Original Documents (Lichtbildarchiv älterer Originalurkunden). University of Marburg.
- Testament of Emperor Otto IV dated 1218 at kulturerbe.niedersachsen.de
- . Encyclopædia Britannica. Vol. 20 (11th ed.). 1911. p. 375.