W. Wroth, Catalogue of Imperial Byzantine Coins in the British Museum, 2 vols. (London, 1908), 2, p. 539; G. Zacos and A. Veglery, Byzantine Lead Seals (Basel, 1972), nos. 99 (a & b), 100; J. Nesbitt, N. Oikonomides et al. (eds.), Catalogue of Byzantine Seals at Dumbarton Oaks, 7 vols. (Washington, DC, 1991 –), 6, no. 86.1.