Would that the Roman people had but one neck!
Utinam populus Romanus unam cervicem haberet!
Source, in full
In Suetonius, Life of Gaius Caligula, sec. 30, as translated in Charlotte Mary Yonge, Landmarks of History. Ancient History: From the Earliest Times to the Mahometan Conquest (London: John and Charles Mozley, 1852) ch. 13, pt. 4, p. 171
Notes from Wikiquote
I wish the Roman people had but one neck. | Alexander Thomson, The Lives of the First Twelve Cæsars (London: G. G. and J. Robinson, 1796) p. 346 | Compare: Byron, Don Juan, canto 6, st. 27