Emperor Frederick II

de bene esse: literally, of well-being, morally acceptable but subject to future validation or exception

Dorothea Weltecke takes a look at Frederick II...

http://www.medievalists.net/2013/12/29/emperor-frederick-ii-sultan-of-lucera-friend-of-the-muslims-promoter-of-cultural-transfer-controversies-and-suggestions/

Emperor Frederick II, 'Sultan of Lucera', 'Friend of the Muslims', Promoter of Cultural...

medievalists.net

Already in his own time, he aroused responses ranging from profound adoration to vehement rejection.