Note 4 — Chapter I · INTRODUCTION.
S. G. C. (Samuel George Chetwynd) Middlemore translation
C. Winckelmann, De Regni Siculi Administratione qualis fuerit regnante Friderico II., Berlin. 1859. A. del Vecchio, La legislazione di Federico II. imperatore. Turin, 1874. Frederick II. has been fully and thoroughly discussed by Winckelmann and Schirrmacher.