according to the Library. Yorkshire is a massive territory and the dialects are not identical in all areas. In fact, the dialect in North Yorkshire and Humberside/East Yorkshire is "quite different [than in West Yorkshire and South Yorkshire] and has a much stronger Scandinavian influence". One report explains the geographic difference in detail:This distinction was first recognised formally at the turn of the 19th / 20th centuries, when linguists drew an isophone diagonally across the county from the northwest to the southeast, separating these two broadly distinguishable ways of speaking. It can be extended westwards through Lancashire to the estuary of the River Lune, and is sometimes called the Humber-Lune Line. Strictly speaking, the dialects spoken south and west of this isophone are Midland dialects, whereas the dialects spoken north and east of it are truly Northern. It is possible that the Midland form moved up into the region with people gravitating towards the manufacturing districts of the West Riding during the Industrial Revolution. Though distinct accents remain, dialects are no longer in everyday use. Some have argued the dialect was a fully fledged language in its own right. The county has also produced a set of Yorkshire colloquialisms, which are in use in the county. Among Yorkshire's traditions is the Long Sword dance. The most famous traditional song of Yorkshire is On Ilkla Moor Baht 'at ("On Ilkley Moor without a hat"), it is considered the unofficial anthem of the county. Literature and art Although the first Professor of English Literature at Leeds University, F. W. Moorman, claimed the first extant work of English literature, Beowulf, was written in Yorkshire, this view does not have common acceptance today. However, when Yorkshire formed the southern part of the kingdom of Northumbria there were several notable poets, scholars and ecclesiastics, including Alcuin, Cædmon and Wilfrid. The most esteemed literary family from the county are the three Brontë sisters, with part of the county around Haworth being nicknamed Brontë Country in their honour. Their novels, written in the mid-19th century, caused a sensation when they were first published, yet were subsequently accepted into the canon of great English literature. Among the most celebrated novels written by the sisters are Anne Brontë's The Tenant of Wildfell Hall, Charlotte Brontë's Jane Eyre and Emily Brontë's Wuthering Heights. Wuthering Heights was almost a source used to depict life in Yorkshire, illustrating the type of people