4th Earl's nephew and successor, and was developed as a planned settlement, then known as "Harbour and Barony of Keith Insche commonly called Peterhead". The town's first known population totalled 56. The 12 original feuars occupied land along Seagate between the pier of Port Henry, to the north, and the Quinzie (Queenie) to the south. The Queenie was a causeway of boulders, covered only by spring tides, which linked the islands of Keith Inch and Greenhill to the mainland. Today, the Queenie Bridge, which opened in 1954, connects Bridge Street and Greenhill Road. It replaced a swing bridge which had stood on the site since 1850 and built to a cost of £8,000."Historic north-east bridge reopens as part of £50million redevelopment" - Press & Journal, 20 October 2018 The construction of Port Henry in 1593 encouraged the growth of Peterhead as a fishing port and established a base for trade. (Port Henry Road, running east-west, is just north of the harbour, off East North Street.) Port Henry, the oldest of Peterhead's three harbours, was constructed along the Seagate shore by Henry Middleton, under the supervision of Keith. It was protected to the north by the Old Pier, which was probably erected before 1593. The town developed uphill between the shore and Longate, which — until the development of Broad Street in the late 18th century — was the main historic district of the town. Port Henry was improved in 1631 and repaired before the end of the century and again early in the 18th century. The south pier was increased in height and the west pier was constructed. The southern part was reconstructed between 1775 and 1781 by John Smeaton, with improvements carried out by John Rennie between 1806 and 1810. He also oversaw an addition to the west pier in 1813. By 1680, Charles McKean notes that Peterhead "had become one of the best fishings on the north coast". Around the same time, the town had gained a reputation as a watering place with both bath houses and mineral wells, but both are now gone. 18th century On 22 December 1715, James Francis Edward Stuart, Prince of Wales, arrived in Peterhead from Dunkirk and stayed "in an ancient house in Longate," where he was visited by the Earl Marischal. The Marischal's last Baron Baillie, Thomas Arbuthnot, put the town on alert for war by summoning able-bodied men and their