Note 125
From Chapter 49 of the Decline & Fall

Ipse enim vos, non imperatorem, id est suâ lingua, sed ob indignationemid est regem nostrâ vocabat (Liutprand, in Legat. in Script. Ital. tom. ii. pars i. p. 479).

The pope had exhorted Nicephorus, emperor of the Greeks, to make peace with Otho, the august emperor of the Romans —

quae inscriptio secundum Graecos peccatoria et temeraria ... imperatorem inquiunt, universalem, Romanorum, Augustum, magnum, solum, Nicephorum (p. 486).