Review article: P. Vasunia, ‘The comparative study of empires’, Journal of Roman Studies 101 (2011), 222-237. Reviews: A. Cameron, Anglo-Hellenic Review 40 (2009), 24; C. J. Tuplin, Bryn Mawr Classical Review 2009.10.14; E. K. Bacon, Journal of World History 21 (2010), 734-738; C. Foss, Classical Journal online 2010.03.03; D. P. Tompkins, Classical Review 61 (2011), 166-169.