Question: The Bytham River was one of the great Pleistocene rivers of central and eastern England until it was destroyed by the extreme Anglian Glaciation around 450,000 years ago, it is named after which village and civil parish of around 300 houses in South Kesteven, Lincolnshire, England?

Context paragraphs:
Cromerian Stage: The Cromerian Stage or Cromerian Complex, also called either the Cromerian, Cromerian interglacial, (German: "Cromerium" ) or, rarely the Cromerian warm period ("Kromer-Warmzeit" or "Cromer-Warmzeit"), is a stage consisting of multiple glacial and interglacial periods in the Middle Pleistocene epoch.  It is named after the East Anglian town of Cromer in England where interglacial deposits that accumulated during part of this stage were first discovered.  The stratotype for this interglacial is the 'Cromer Forest Bed' situated at the bottom of the coastal cliff near West Runton (East Anglia).  The 'British' Cromerian with the rank of a stage forms part of the superstage that is known as the Cromerian Complex in Europe.  In Central Europe, the Cromerian Complex ("Cromer-Komplex") is divided into three glacials and four interglacials, which are equivalent to Marine Isotope stages 13 to 21.  In the Alpine region it may also be referred to as the Günz-Mindel interglacial, the warm period between the Günz and Mindel glaciations.  In Britain, sediments deposited during the Cromerian (s.s.) precede those of the Anglian Stage and are on top of Beestonian Stage sediments.  In the British isles several interglacials of 'Cromerian affinity' are known from this timeframe, one of these is the type Cromerian.  Opinions of the exact correlation of British and continental Cromerian differ.  Based upon the beginning of Marine Isotope Stage 21 and the end of Marine Isotope Stage 13, the Cromerian Complex started 866,000 years ago and ended 478,000 years ago.

Castle Bytham: Castle Bytham is a village and civil parish of around 300 houses in South Kesteven, Lincolnshire, England.  The population was measured at 768 in 317 households at the 2011 census.

Careby: Careby is the principal village in the a civil parish of Careby Aunby and Holywell {where the population is included} in the South Kesteven district of South Kesteven, Lincolnshire, England.  The River West Glen flows through the parish, near Careby, forming part of the parish boundary.

Little Bytham: Little Bytham is a village and civil parish in the South Kesteven district of Lincolnshire, England.  The population of the civil parish at the 2011 census was 384.  It lies on the B1176 road, 4 mi south from Corby Glen and 6 mi north from Stamford .

Riss glaciation: The Riss glaciation, Riss Glaciation, Riss ice age, Riss Ice Age, Riss glacial or Riss Glacial (German: "Riß-Kaltzeit" , "Riß-Glazial ", "Riß-Komplex " or (obsolete) "Riß-Eiszeit ") is the second youngest glaciation of the Pleistocene epoch in the traditional, quadripartite glacial classification of the Alps.  The literature variously dates it to between about 300,000 to 130,000 years ago and 347,000 to 128,000 years ago.  It coincides with the Saale glaciation of North Germany.  The name goes back to Albrecht Penck and Eduard Brückner who named this cold period after the river Riss in Upper Swabia in their three volume work "Die Alpen im Eiszeitalter " ("The Alps in the Ice Age") published between 1901 and 1909.

Great Ponton: Great Ponton is a village and civil parish in the South Kesteven district of Lincolnshire, England.  It is situated 3 mi south of Grantham, on the A1 trunk road, which bisects the village.  The tower of the parish church is a landmark beside the road.  In the 2001 Census, the population of the village was recorded as 333, of whom all were of white ethnic origin and 87% described themselves as Christian.  The average age was 40.  The population of the civil parish had risen to 379 at the 2011 census.

Tallington: Tallington is a village and civil parish in the South Kesteven district of Lincolnshire, England.  The population of the civil parish at the 2011 census was 497.  It is situated 4 mi east from Stamford and 8 mi north-east from the centre of Peterborough.  The village has around 200 houses.

Bytham River: The Bytham River was one of the great Pleistocene rivers of central and eastern England until it was destroyed by the extreme Anglian Glaciation around 450,000 years ago.  It is named after Castle Bytham in Lincolnshire.  Its catchment area included Worcestershire, Warwickshire, Oxfordshire and Derbyshire, and it flowed eastward across East Anglia to the North Sea.

Great Gonerby: Great Gonerby is a village and civil parish in the South Kesteven district of Lincolnshire, England.  The population of the civil parish at the 2011 census was 2,200.  It is situated less than 1 mi north from Grantham.  To its north is Gonerby Moor, part of Great Gonerby civil parish, and the A1 road.  It is 330 ft above sea level and overlooks the Vale of Belvoir to the west and Grantham to the south.

Crag Group: The Crag Group is a geologic group in East Anglia and adjacent areas of the North Sea.  The Crag Group are a series of geological layers in a tidally dominated shallow marine bay in the Pliocene and until the Late Pleistocene, between 5,330,000 and 478,000 years ago.  Britain was then connected to continental Europe by a ridge called the Weald–Artois Anticline, which was destroyed by the extreme Anglian Glaciation which started around 478,000 years ago.

Supporting paragraphs: Bytham River Castle Bytham
Answer: Castle Bytham