The column is 83 feet tall and topped by the Percy Lion, symbol of the Percy family. It was designed by Charles Harper and erected as thanks to the second Duke of Northumberland, by tenants of the Duke in 1816, following a reduction by the Duke in their rents. (Interestingly, this is some 24 years before Nelson's Column was erected.)
Anecdotal history suggests there is slightly more to the story of the column; local website www.rothbury.com (http://www.rothbury.com/village/around/percy.htm) sums matters up thus:
During the 19th century local farmers profited, very nicely thank you, from the high cost of goods sold to support the war with France. The Duke, reviewing his rents, as one does, saw fit to suggest a small increase; double or possibly quadruple. And everyone was happy.
Unfortunately when peace broke out, reduced prices in the market place created a cash flow problem and farmers were unable to meet the vastly increased rents. They commented on this to the Duke who reduced the rents accordingly.
The tenants in their turn, felt beholden to such generosity and erected a column, topped by the Percy Lion to express their gratitude to the Duke.
The Duke in his turn decided that if the tenantry could afford such an edifice then they could afford the rents which were promptly raised again. The cost of this edifice was such that with the re-imposed rental increase farmers were unable to survive and promptly went into bankruptcy. But the subscriptions were insufficient to complete the monument and the Duke was forced to finish it himself. Noblesse Oblige. Also interesting as it is reported that the Duke died before its completion.
There's supposedly an explanation about the sticking-outiness of the column lion which is that it is pointing to Scotland and the tail will wag when the last Scotsman returns to Scotland.
The other theory was that the sticking out tail was originally only found on statues (the bridge and the column) and they were made that way because it was easy to make.
During this war the Duke was in charge of the Percy Tenantry Regiment and it is said that having fought alongside them he couldn't see them suffer and so cut the rents.