Key dates in the history of Somerset 43–47 – Roman invasion and occupation 491 – Battle of Mons Badonicus (may have been fought in Somerset) (uncertain date) 537 – Battle of Camlann (sometimes located at Queen Camel) (uncertain date) 577 – Battle of Deorham (Dyrham, Gloucestershire) – Saxons occupied Bath 658 – Battle of Peonnum (Penselwood ?) – Saxons then occupied most of Somerset 710 – Battle of Llongborth (? Langport) 845 – First documentary reference to "Somersæte" 878 – Battle of Cynwit – Saxon victory over the Danes by Ealdorman Odda 878 – Battle of Ethandun – West Saxon victory over the Danes (uncertain whether in Somerset or Wiltshire) 878 – Treaty of Wedmore – after defeat of Danes by King Alfred the Great c900 – Kings of Wessex hold court at Cheddar 973 – King Edgar of England crowned at Bath 988 – St Dunstan buried at Glastonbury 1013 – Danish king Sweyn Forkbeard received submission of western thegns at Bath 1088 – Siege of Ilchester 1191 – Discovery of "King Arthur's" tomb at Glastonbury 1497 – Perkin Warbeck's rebellion supported by Somerset men 1643 – Battle of Lansdowne 1645 – Siege of Taunton during the English Civil War 1685 – Battle of Sedgemoor – Duke of Monmouth defeated 1685 – Judge Jeffries holds the "Bloody Assizes" at Taunton 1770 – Start of major enclosures of Somerset Levels 1805 – Somerset Coal Canal Opened 1827 – Bridgwater and Taunton Canal opened 1875 – Formation of Somerset County Cricket Club 1898 – County boundaries altered 1956 – Chew Valley Lake opened by Queen Elizabeth II 1974 – Formation of County of Avon, reducing the area of the County of Somerset 1996 – Abolition of the County of Avon, creating the unitary authorities of North Somerset and Bath and North East Somerset