Zarina (forced mate [agressor])
Unexplored, though Zarina thinks he's a clown and hates him, for whatever reason.
Fall From GraceEdit
It is revealed in Fall From Grace that the Duke is good friends with Risku and has a rather shameless attraction to Zarina. Eventually, despite Usodai's angry protests against it, he does get Zarina as his own mate in the end, which ironically is completely Usodai's fault.