Other notable 18th and 19th century landscape painters include: George Arnald (1763-1841); John Linnell (1792-1882), a rival to Constable in his time; George Morland (1763-1804), who developed on Francis Barlow's tradition of animal and rustic painting; Samuel Palmer (1805-1881); Paul Sandby (1731-1809), who is recognised as the father of English watercolour painting; and subsequent watercolourists John Robert Cozens (1752-1797), Turner's friend Thomas Girtin (1775-1802), and Thomas Heaphy (1775–1835).