Heineccii Element. Juris Civilis secund. ordinem Pandect. tom. i. p. 70. See likewise Spanheim de Usu Numismatum, tom. ii. dissertat. x. p. 1 l 9. In the year 450 Marcian published a law that three citizens should be annually created praetors of Constantinople by the choice of the senate but with their own consent. Cod. Justinian. 1. i. tit. xxxix. leg. 2.