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Perth town walls, together with Perth Castle, comprised the medieval defences of the royal burgh of Perth, Scotland.

The earliest town defences comprised a series of ditches that also served as a mill lade. The castle was located outside this defended area to the north, but was destroyed by a flood in 1209 and never rebuilt. The town defences were strenghtened in the 14th century with the construction of stone walls. By the 1760s the walls had become obsolete and were demolished. A few sections survived into the 19th century, but no certain remains stand today.

The walls enclosed the burgh on three sides, with the east side open to the River Tay, and followed the modern streets of Mill Street, Methven Street and Canal Street. A series of "ports" (gates) gave access to the burgh, and several towers provided additional strength, including the Spey Tower and Monk's Tower.

Background
Perth is sited at an important crossing point of the River Tay, and a trading settlement and harbour was present from the earliest times. This settlement was granted the status of a royal burgh by David I in the early 12th century, giving certain trading rights to its inhabitants. Several religious houses were established at Perth in the 12th and 13th centuries, and it was one of Scotland's richest burghs at this time.

The earliest defences probably date from the 12th century, and were based on a series of ditches dug between the River Almond and the River Tay. The main ditch or mill lade flowed west to east along the north boundary of the burgh, with a cut taking water around the west and south boundaries as well. The lade provided power to water mills as well as demarcating the burgh boundary. It is likely that additional defences at this stage would have comprised a wooden palisade inside the lade. It is speculated that the north-south streets close to the Tay form the original core of the burgh, with rapid growth in the 12the century leading to the establishment of the east-west High Street and South Street, and expansion of the burgh to meet the lade.

Perth Castle
Perth Castle was a 9th-century castle in Perth, Scotland. The Danes attacked the castle in the 9th century.

A motte-and-bailey castle was built in the 12th century. The castle was once a royal residence. King Malcolm IV of Scotland was besieged at the castle in 1160 by Ferchar, Earl of Strathearn and five other earls. A flood in 1290 damaged the motte mound and required the castle to be rebuilt. King Edward I of England captured the castle in 1298 and 1303. It was captured by King Robert I of Scotland in 1312. Nothing remains above ground.

Reliques
Spey Tower, also known as Spy Tower, was a medieval gatehouse in Perth, Scotland. The tower was part of the Perth city walls and was located near to Gowrie House. It guarded the south gate of the city, close to the River Tay.

The tower contained a strong prison. Cardinal David Beaton confined people whom he had condemned for heresy, and witnessed their execution from the tower. The hereditary keepers of the tower were at one time the Rosses of Craigie.

The tower stood near the site of the Perth County Buildings, and was demolished in 1766.