In the stimulating recent past I too was occupied with the rewakening of Frederick the Red-beard, so longed for by so many, and strove with added zeal to satisfy an earlier wish to use my feeble breath to breathe poetic life into the hero-Kaiser for our acting stage. The outcome of the studies by which I sought to master my subject I have embodied in the following work: though its details may contain nothing new to the researcher or student of that branch of literature, yet their allocation and employment seemed interesting enough to some of my friends to justify the printing of the little sketch. I consented the more readily, as this prelude will remain the only fruit of my labours on the stuff itself; labours which themselves impelled me to abandon my dramatic plan, for reasons that will not escape the attentive reader.