ROSEL.  f.  Swiss.  Yonge thinks it originated as a term of endearment.  It may be a diminutive form of Rose (q.v.), "little rose," or from the French nickname rousel, meaning "little red one."  See Russell.  Along with Rosette, it occurred at Cambrai between 900 and 1200.  Also see Roseli. (History of Christian Names, Yonge, 1884). 

"It is what I suspected, only worse," said Lorenz.  "There were stories going about at the time, that Rosel, the eldest of these Dietrichs, was never sent away at all, but was kept shut up here after she went raving mad.  But no one knew for certain.  And of late the thing was forgotten, and the younger generation knew nothing about it.  But you see how it is!  The unfortunate, miserable creature has been kept here chained like a dog, starved, beaten; her own child, sir!  Her own flesh and blood!  And now that she-devil has killed her." (All The Year Round, Dickens, 1875).