The Auld Brig is said to date from the reign of Alexander III.
To the west of the present line of Port Street, and the "auld brig" ‚over the Forth to the north, a quaint high-pitched structure of four arches, now closed to traffic. It dates from the end of the 14th century and was once literally "the key to the Highlands."
From the new bridge of Don to the "auld brig" of Dee there is tramway communication via King Street, Union Street and Holburn Road - a distance of over five miles.
A little to the west is the Auld Brig o' Balgownie, a picturesque single arch spanning the deep black stream, said to have been built by King Robert I., and celebrated by Byron in the tenth canto of Don Juan.
Every sentimental consideration was against a Union with a prelatic kingdom, " an auld enemy," which drove a hard bargain by threats of excluding Scottish commodities.