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Kelso (Scots: Kelsae, Scottish Gaelic: Cealsaidh) is a market town and civil parish in the Scottish Borders area of Scotland. It lies where the rivers Tweed and Teviot have their confluence, and until 1975 was part of the county of Roxburghshire. Kelso's main tourist draws are the ruined Kelso Abbey and Floors Castle, a William Adam designed house completed in 1726. The bridge at Kelso was designed by John Rennie who later built London Bridge. The town of Kelso came into being as a direct result of the creation of Kelso Abbey in 1128. The town's name stems from the fact that the earliest settlement stood on a chalky outcrop, and the town was known as Calkou (or perhaps Calchfynydd) in those early days. In Roxburgh Street is the outline of a horseshoe petrosomatoglyph where the horse of Charles Edward Stuart cast a shoe as he was riding it through the town on his way to Carlisle in 1745. He is also said to have planted a white rosebush in his host's garden, descendants of which are still said to flourish in the area. For some period of time the Kelso parish was able to levy a tax of 2 pence on every Scottish pint of ale, beer or porter sold within the town. The power to do this was extended for 21 years in 1802 under the Kelso Two Pennies Scots Act when the money was being used to replace a bridge across the river Tweed that had been destroyed by floods.