31. No complete example of an imperial diptych survives and so their existence is contested. 32. This is evident in his " Diptychs " and sequencing series " Drift ". 33. This diptych records his second name abbreviated NAR. 34. The anonymous master is named after a diptych in Carthusian monk and Saint Barbara. 35. Her art features Japanese calligraphy, and consists mainly of diptychs expressing modern minimalism. 36. The Monothelite Patriarch Theodore I of Constantinople removed Vitalian's name from the diptychs . 37. The four general councils and the name of Pope Leo were inscribed in the diptychs . 38. Ivory diptychs , often elaborately decorated, were issued as gifts by newly appointed consuls. 39. Private reflection and prayer was encouraged and the small-scale diptych fitted this purpose. 40. The painting was made in circa 1490 1495 and was originally part of a diptych .