A pupil of Cesare Gamba and Carlo Arienti at the Albertina Academy in Turin, Delleani worked initially in the field of history painting and received various marks of official recognition. He exhibited work at the Paris Salon of 1874 and gradually modernised his means of expression and range of subjects at the end of the decade with a new focus on landscape and painting from life. The early 1880s saw an exclusive focus on painting en plein air, capturing light in thick strokes of colour. His most frequent subjects were views of the Piedmontese and Lombard countryside in changing conditions of light and season. The artist’s presentation of some 40 works at the Venice Biennale in 1905 and participation in the International Exhibition in Munich of the same year set the seal on his international success.