Anon., 'Pictures and Articles of Curiosity', in Inventory of the Contents of Warwick Castle,(Warwickshire Record Office CR1886/466), ms., circa 1800, n.p., hanging in the Little Dining Parlour;; Anon., Inventory of the Contents of Warwick Castle, ms., 1806, in the Little Dining Room;; W. Field, An Historical and Descriptive Account of Leamington Spa, Warwick 1815, pp. 210, 214 ('Count Gondomar - by Valasquez de Silva [sic]'), in the Breakfast room, opposite the fireplace - right side;; S. Woodburne, Notes on the Paintings at Warwick Castle, 1832, no. 35 (‘not Gondomar but a true Van Dyck – of a Fleming I think’), in the First Drawing Room;; H. T. Cooke, An Historical and Descriptive Guide to Warwick Castle…, Warwick 1847, p. 77 (‘A very fine Flemish portrait, by VanDyck;. This painting has by many been supposed to have been painted by Velasques (sic)’), in the Breakfast Room;; Cooper’s, History of Warwick and Guide to the Castle, illustrated, 1850, p.107;; G. Waagen, Treasures of Art in Great Britain, vol. III, London 1854, vol. III, p. 212;; F. E. Warwick, ‘Warwick Castle’, in The Pall Mall Magazine, vol. XI, January – April 1897, p. 40 (‘Diego Sarmineto de Acuna, Conde di Gondomar (Spanish Ambassador at the Court of James I) by Van Dyck’), in the Chapel Passage;; Anon., mss. 1900, in the Billiard Room Passage (mentioned as being described at the castle as by Velazquez);; Anon., Inventory of the contents of Warwick Castle, 1959, p. 35, in the Red Drawing Room;; E. Larsen, The Paintings of Anthony van Dyck, Freren 1988, p.131, no.319 (as Van Dyck);; S. J Barnes et al., Van Dyck, A Complete Catalogue of the Paintings, London 2004, p. 218, under no.II.84 (as a good copy).