In Celtic mythology, Angus Og is the god of youth, love and poetic inspiration, described in the Celtic revivalist magazine, The Evergreen as ‘the ever young, the lord of love, of music, of song’. Traditionally described as having singing birds circling his head, in this picture by Duncan he is shown with wings of a swan. Duncan was drawn to the Celtic Revival movement after his return from Chicago in 1904, producing works that were largely inspired by Celtic myth and legend.