"Launceston (/\u02C8l\u0251\u02D0nst\u0259n/ LARN-st\u0259n or /\u02C8l\u0254\u02D0nst\u0259n/ LAWN-st\u0259n), locally /\u02C8l\u00E6ns\u0259n/ LAN-s\u0259n or /\u02C8l\u0251\u02D0ns\u0259n/ LARN-s\u0259n, (Cornish: Lannstevan; rarely spelled Lanson) is a town, ancient borough, and civil parish in east Cornwall, England, United Kingdom.Dunheved was the Southwestern Brittonic name for the town in the West Saxon period.Launceston is centred one mile (1.6 km) west of the River Tamar, which constitutes almost the entire border between the Cornish peninsular and Devon, at its middle stage."@en .