It is highly probable that the blue and white bowl bearing the mark Erying Jiaqi, 'Fine vessel of Erying', was a private commission by Erying, an unknown sobriquet. Compare with a related mark on a blue and white hot-water bowl from the Percival David Foundation, dated to the Jiajing period, included in the joint exhibition, Rare Marks on Chinese Ceramics, illustrated by M. Wilson, Catalogue, 1999, p. 47, no. 13. The David bowl bears a four-character Beiquan Jiaqi, 'Fine Vessel of Beiquan'; and the style name Beiquan was used by the official Lan Tian (1477-1555) who was the Investigating Censor of the Henan Circuit, ibid, p. 46.