Lucas Achtschellinck (baptized 16 January 1626 – buried 12 May 1699), was a Flemish landscape painter. He is counted among the landscape painters active in Brussels referred to as the School of Painters of the Sonian Forest who all shared an interest in depicting scenes set in the Sonian Forest, which is located near Brussels. Life He was born in Brussels and was possibly the grandson of the landscape painter Lukas Achtschelling. He was registered in the Brussels Guild of Saint Luke on 26 October 1639 as a pupil of a Pieter van der Borcht. The 17th century Flemish biographer Cornelis de Bie mentioned that Lucas Achtschellinck also studied with the Brussels landscapist Lodewijk de Vadder but this is not confirmed by Guild records. However, stylistically the two artists are quite close. Achtschellinck likely travelled abroad after completing his apprenticeship since he only became a master in the Brussels guild in 1657. On 13 March 1674 he married Anna Parys. He remained active in Brussels and in 1687 he was the deacon of the Brussels guild. He was successfully and employed 8 pupils including Théobald Michau between 1659 and 1686. He died in Brussels. Work No signed or documented works of Achtschellinck are known, although some monogrammed works are known such as a landscape in the Fondation Custodia and a few works sold at auction. A monogrammed and dated Extensive landscape with figures was at Sotheby's on 24 April 2008, lot 37. These monogrammed works are typically of a small size. There is still some uncertainty about whether Achterschellinck painted larger format works. Some large non-marked works (such as the works in the Groeningemuseum, Bruges) have been attributed to the artist. A scholar has reported seeing a photograph of a signed example in a private collection, but this has not resolved conclusively the issue of the attributions of such large-scale works. These large format works are very close to works by Lodewijk de Vadder and Jacques d'Arthois and may therefore now be in collections where they have been attributed to these other artists. There are a number of landscapes with a clear stylistic relationship that are attributed to the artist. Characteristic features of his style are the broad brush stroke, especially in the depiction of roads, verges and trees. Similarly, the subtle silvery gradation of light and shade on tree trunks, and especially birches, is a recurring characteristic in the