Note 115
From Chapter 17 of the Decline & Fall

The presidents, or consulars, could impose only two ounces; the vice-praefects, three; the proconsuls, count of the East, and praefect of Egypt, six. See Heineccii Jur. Civil. tom. i. p. 75. Pandect 1. xlviii. tit. xix. n. 8. Cod. Justinian. 1. i. tit. liv. leg. 4, 6.