The Royal Burgh The first record of Irvine is in 1163, and the harbour at that time was near the sea-gait or Seagate, the castle being first built to protect it. Progressive silting was recorded by several early authors, who recorded that wind blowing the sand hindered the movement of ships, sometimes stranding them for several months. Irvine was created a Royal Burgh by King
Robert II in 1372 and this castle is the last of the town's old civil and ecclesiastical buildings to survive, the
Carmelite friary, tollbooth, chapel, bridge, and
port having vanished without trace.
The castle Benedict of Peterborough in 1184 records a castle of 'Hirun', which has been taken as referring to Irvine. The original, probably-wooden castle tower or motte, was therefore built some time before 1184, being rebuilt in stone in the 1360s and then remodelled and expanded by Hugh the 3rd
Earl of Eglinton, around 1565. In the twelfth century the castle of Irvine lay within the lordship of Cunninghame, which had been granted by
David I to
Hugh de Morville,
Lord High Constable of Scotland. In 1196 the lordship passed from the de Morville family, through failure of male heirs, and then descended through various families, among whom were the
Balliols. Robert the Bruce granted the lordship to Robert the Steward. In 1366 the castle passed into the possession of Sir Hugh de Eglintoun, along with the office of chamberlain of Irvine and bailie of the Barony of Cuninghame, in style more a palace, place, or mansion house. Coat of Arms of the late seventeenth century The castle is thought by some to incorporate the remnants of the strong twelfth-century castle of 'Irewin', described as being a stronghold of some strength in 1184, however, this has not been verified. The triangular tower in the north-west corner has been suggested as having been part of this earlier castle. In 1945 Seagate Castle was given to the Burgh of Irvine by Mrs. Walker of Castlepark. Irvine Development Corporation (IDC) funded a trial excavation in October 1992 to locate the medieval castle. It revealed mediaeval deposits to a depth of 2.8m. and a short length of wall, however, no clear dating evidence was unearthed. The three panelled armorial panel may have carried the full conjoined arms at the top and the standard coat of arms of Montgomerie and Drummond at the bottom.
Constables Seagate castle was held by a
Constable on behalf of the lord; Irvine muniments records show that Philip de Horssey was constable as son-in-law to
Richard de Morville; between 1391 and 1425 the post was held by Thomas de Vauce; in 1428 John de Brakanrig inherited the post through his wife; in 1438 Thomas Spark held the post and sold lands and the post of constable to William Cunningham of Craigends. An annual payment of two merks had been made throughout this time and this ceased with the post's demise in 1596. The castle is entered through a vaulted
pend running through the north section of the main block, which has a fine ornamental arched doorway, opening into the courtyard and having similarities with the southern entrance passageway at
Linlithgow Palace. A lengthy main block faces the street, to the east of this three towers projected, two were round and one was triangular; probably because of the lie of the land. It has been suggested that this tower is of a much older construction, but other authorities dispute this. A small guardroom and a prison pit may have existed in this area. The kitchen has an arch, a large window, and
aumbries, together with a
serving hatch in the adjoining passageway.
Kilwinning Abbey was being sacked and progressively demolished at this time and stonework may have been removed to build this doorway and also used for the building of the rest of the structure. The Romanesque mouldings at Seagate have been compared with similar work, circa 1573, found at
Blairquhan (old) Castle, possibly
Maybole, and several other West of Scotland castles. A cesspool was conveniently, but unhygienically located just outside the back door of the kitchen in the courtyard, with a channel running to it from the fireplace. Other pipes linked to this channel from
garderobes upstairs. In 2010 the building, although still roofless and ruinous, exhibits the high status of its former status as a town house; council minutes record that some restoration works were carried out by Enterprise Ayrshire in the 1990s, the town council having had some repairs carried out in 1971. ==The Montgomeries==