César de Cock was a 19th century Belgian (Flemish) painter who spent much of his career in France. He initially studied at the School of Fine Arts in Ghent, where he was born, but in France became a pupil of Charles-François Daubigny,
Cesar de Cock, along with his elder brother, painter Xavier de Cock, became friends with Barbizon School painters Jean-Baptiste-Camille Corot and Théodore Rousseau, and the influence of the French artists is evident in the work of both of the brothers.
César, in particular, had a wonderfully textural approach and an affinity for compositions with small streams.
Web resources for César de Cock are more scattered than for many artists, but a number of auction sites offer detailed zoomable images of his work.