Institut. l. i. tit. ii. No. 6. Pandect. l. i. tit. iv. leg. 1. Cod. Justinian, l. i. tit. xvii. leg. 1, No. 7. In his Antiquities and Elements , Heineccius has amply treated de constitutionibus principum , which are illustrated by Godefroy (Comment. ad Cod. Theodos. l. i. tit. i. ii. iii.) and Gravina, (p. 87 - 90.)