Liborio Grue of Castelli (1702-1779/80) and his brother Aurelio founded a short-lived factory at Atri. Liborio's style is associated with dramatic biblical and mythological scenes, often incorporating figures copied from Annibale Carracci's ceiling paintings in the Farnese Palace, Rome. For a large vase painted with the same scene of Triton and a nereid playing pan-pipes and attributed to Liborio Grue see Vincenzo de Pompeis and Andrea Antico et al., Maioliche di Castelli nella Collezione Acerbo in Loreto Aprutino Pescara, Pescara, 2001, pp. 72-74, no. 47. Signed pieces by Liborio Grue are particularly unusual and only one other appears to be recorded in the literature, see the bowl and cover painted with similar figures after Annibale Carracci, signed Liborius Grue P., in the collection of the Victoria and Albert Museum, illustrated by Bernard Rackham, Guide to Italian Maiolica, London, 1933, p. 77, pl. 44. See also the two covered bowls decorated with similar figures and mask cartouches in the Matricardi Collection, illustrated by Carola Fiocco et al., Capolavori della Maiolica Castellana dal Cinquecento al Terzo Fuoco, Exhibition Catalogue, Teramo, 2012, pp. 188-190, nos. 139-140.