The font is "Priory" http://ww.1001freefonts.com/Priory.php (http://ww.1001freefonts.com/Priory.php) and although it shows up under Preferences>Fonts it does not display. Does anybody know why?
It seems that the OS/2 version of Priory is equal to 0. That should generate troubles and maybe explains why Scribus no uses it.
See also http://docs.scribus.net/index.php?lang=en&page=fonts2 (http://docs.scribus.net/index.php?lang=en&page=fonts2) for more informations.