C. Kingsley Adams. "Portraiture Problems and Geneology." Genealogist's Magazine 14, no. 11 (September 1964), pp. 387–88, explains how the sitter for three pastels by Rosalba, including the present work, came to be identified as Horace Walpole and that he is instead the 2nd Viscount Boyne.
C. Kingsley Adams and W. S. Lewis. "The Portraits of Horace Walpole." Walpole Society 42 (1970), pp. 27–28, no. C.5, pl. 28c, identify the sitter as Gustavus Hamilton, 2nd Viscount Boyne.
Introducing Francis Cotes, R.A. (1726–1770). Exh. cat., Nottingham University Art Gallery. Nottingham, 1971, p. 18, under no. 2, relates this composition to Cotes's "Young Man in a Three-cornered Hat" (Leicester Museum and Art Gallery) of 1747.
Francis Russell. "The British Portraits of Anton Raphael Mengs." National Trust Studies 1979 (1978), pp. 14, 16, notes that a pastel portrait of William Burton, later Conyngham, by Mengs was framed in the eighteenth century as pendant to a version of Rosalba's portrait of Lord Boyne [this picture]; suggests that the Mengs pastel [now J. Paul Getty Museum, Malibu] was commissioned as a pair to Rosalba's, probably for the 1st Earl of Leitrim.
Bernardina Sani. Rosalba Carriera. Turin, 1988, p. 311, no. 268, fig. 235, calls it "una bellissima replica" of the London pastel; gives incorrect dimensions.
Francis Russell. "Book Reviews: Rosalba Carriera by Bernardina Sani, 1988." Burlington Magazine 131 (December 1989), p. 857, points out that Sani omits what was probably the first version, at Wolterton.
Venetian Baroque and Rococo Paintings. Exh. cat., Walpole Gallery. London, 1990, p. 30, calls the Walpole pastel clearly the prime version.
Steffi Roettgen. Anton Raphael Mengs 1728–1779 and his British Patrons. Exh. cat.London, 1993, p. 58, supports Russell's view that a pastel by Mengs of William Burton Conyngham (private collection) was made to match a pastel of Lord Boyne by Rosalba Carriera [this work]; comments on their matching frames and on the rarity of pastel for grand tour portraits.
Elizabeth Einberg in Grand Tour: The Lure of Italy in the Eighteenth Century. Exh. cat., Tate Gallery. London, 1996, p. 55.
John Ingamells. A Dictionary of British and Irish Travellers in Italy 1701–1800. New Haven, 1997, p. 116, mentions a pastel of Boyne by Rosalba Carriera (private collection) and gives biographical details and bibliography.
Steffi Roettgen. "Das malerische und zeichnerische Werk." Anton Raphael Mengs, 1728–1779. 1, Munich, 1999, p. 274, states that the frames for this portrait and Mengs's portrait of Conyngham at Killadoon are nineteenth-century (rather than eighteenth-century), and thus cannot lend support to the identification of the two pastels as pendants.
Revolution in Art. Sotheby's, New York. January 24, 2002, pp. 16–18, no. 54, ill. (color, framed and unframed), states that it was painted in 1730 or 1731, when Lord Boyne stayed several times in Venice during his Grand Tour.
Sarah Rhiannon Drumm. "The Irish Patrons of Rosalba Carriera (1675–1757)." Irish Architectural and Decorative Studies 6 (2003), pp. 205, 209, 212, no. 4, colorpl. 1, theorizes that since Hamilton and Nathaniel Clements were friends, Hamilton might have bequeathed the pastel to Clements as a memento, or Hamilton's family might have presented it to Clements after Hamilton's death.
Neil Jeffares. Dictionary of Pastellists Before 1800. London, 2006, p. 91, ill. (color).
Bernardina Sani. Rosalba Carriera, 1673–1757: maestra del pastello nell'Europa "ancien régime". Turin, 2007, pp. 39–40, 272, 275, 322, no. 302, ill.
Emma-Louise Hunt. "The Grand Tourist." Christie's Magazine 25 (July–August 2008), p. 38.
Catherine Whistler. "Rosalba Carriera e il mondo britannico." Rosalba Carriera, 1673–1757. Verona, 2009, pp. 186, 204 n. 25, fig. 4.
Catherine Whistler. "Venezia e l'Inghilterra: artisti, collezionisti e mercato dell'arte, 1700–1750." Il collezionismo d'arte a Venezia: il Settecento. Venice, 2009, pp. 96, 101 n. 42.
T. D. Llewellyn. Owen McSwiny's Letters, 1720–1744. Verona, 2009, pp. 36, 54 n. 133, p. 335 n. 1117, 380, pl. 10, proposes that McSwiny introduced Lord Boyne to Carriera; states that the portrait by Rosalba of Boyne in McSwiny's sale in 1755 is either the MMA or Birmingham version.
Katharine Baetjer and Marjorie Shelley. "Pastel Portraits: Images of 18th-Century Europe." Metropolitan Museum of Art Bulletin 68 (Spring 2011), pp. 10–11, 16, 23, 25, 44, no. 4, ill. (color, overall and detail).
Neil Jeffares. "Rosalba Carriera, 'Gustavus, Viscount Boyne'." Pastels & Pastellists. June 25, 2011, ill. (color) [http://www.pastellists.com/Essays/Carriera_Boyne.pdf?zoom_highlight=boyne#search="boyne"].
The Libertine: The Art of Love in Eighteenth-Century France. New York, 2013, ill. p. 355 (color).