Question: When did the stronghold of the Boyd Family begin to be built?

full_context: Document 1: Ardrossan Castle: Ardrossan Castle is situated on the west coast of Scotland in the town of Ardrossan, Ayrshire. The castle, defended by a moat, stands on a ridge above the town. There is a keep dating from the fifteenth century, and a vaulted range containing a kitchen and cellars. In a deep passageway there is a well. Part of the keep remains up to the corbels of the parapet, but it is in ruins. The original castle, owned by Clan Barclay, was partly destroyed during the Wars of Scottish Independence. This event, in which the English garrison were slaughtered, became known as "Wallace's Larder," a name which is still applied to the remaining vaults. Rebuilt by Clan Montgomery in the 15th century, Ardrossan later fell into disuse and was partially demolished by the soldiers of Oliver Cromwell in the 17th century who used the stones to help construct the Ayr Citadel.
Document 2: Knockhall Castle: Knockhall Castle is a historic Scottish castle near to Newburgh, Aberdeenshire. It was built by Lord Sinclair of Newburgh in 1565. It was purchased by Clan Udny, who moved into the castle in 1634. The building was damaged in 1639 when taken by the Earl Marischal for the Covenanters, but was later returned to Udny hands. The Clan remained in the castle until 1734, when an accidental fire gutted the building and the Clan moved back to their other property, Udny Castle. Jamie Fleeman, the Laird of Udny's fool, is credited with saving the life of the family in the fire. The castle remains a ruin to this day and are designated a scheduled monument.
Document 3: Kildrummy Castle: Kildrummy Castle is a ruined castle near Kildrummy, in Aberdeenshire, Scotland. Though ruined, it is one of the most extensive castles dating from the 13th century to survive in eastern Scotland, and was the seat of the Earls of Mar. It is owned today by Historic Scotland and is open to the public as a scheduled ancient monument.
Document 4: Somerton Castle: Somerton Castle is located approximately one mile west of the village of Boothby Graffoe in Lincolnshire, England and to the south of the city of Lincoln, England. The site is on low-lying land between the Lincoln Edge and the River Trent. Although Somerton Castle is in the parish of Boothby Graffoe, it is in the Manor of Waddington and this portion is often referred to as the "Manor of Somerton Castle". Antony Bek probably built the castle in 1281 and he gave it to King Edward II in 1309. King John II of France was imprisoned at Somerton Castle between 1359 and 1360, having been taken prisoner after the Battle of Poitiers. It continued as crown property until it was sold by Charles I in 1628, since when the castle has continued in private ownership.
Document 5: Sir Thomas Boyd: Sir Thomas Boyd of Kilmarnock was a 14th-century Scottish landowner and lord of Kilmarnock in Ayrshire. He was the son of Sir Robert Boyd, who fought at the Battle of Bannockburn. In 1346, he was taken prisoner at the battle of Neville's Cross. He is known for building the earliest parts of Dean Castle in around 1350, and the castle still stands today and is open to the public. Sir Thomas was succeeded by his son, Thomas (died 1432). Sir Thomas' later descendants were the Earls of Kilmarnock.
Document 6: Dean Castle: Dean Castle is situated in the Dean Castle Country Park in Kilmarnock, East Ayrshire, Scotland. It was the stronghold for the Boyd Family, who were lords of Kilmarnock for over 400 years.
Document 7: Barony of Bannockburn: The Barony of Bannockburn is a Scottish feudal barony located in the historical county of Stirlingshire. The first barons of Bannockburn were from the Sandilands and Vere families, descendants of a man named James who around 1348 had been granted the territory of Sandilands, Lesmahagow Lanarkshire, taking the territorial name as his surname. He was also later granted the barony of Calder near Edinburgh. The link of the Sandilands to Bannockburn was established on 14 July 1489, when King James IV confirmed James Sandelands of Calder and his wife Margaret Kerr his wife in the lands of Bannockburn. By 7 July 1509, James Calder had transferred Bannockburn to his son. On that date, King James IV confirmed a charter by Sir James Sandelands of Calder granting various lands including the barony of Ouchterbannok alias Bannockburn to his son James Sandelands. On 23 August 1510, King James IV granted Sir James Sandelands of Caldour (nephew of Sir James Sandelands and his wife Mariota Forrester), various lands including the lands and barony of Bannockburn. Robert De Vere the 6th. Earl of Oxford accompanied Edward the 2nd. on his campaign which culminated in defeat by the victorious King Robert the Bruce at the Battle of Bannockburn on the 23rd and 24th. of June 1314. It is by a quirk of fate that the barony of Bannockburn was granted to the Sandilands as they were close relatives to the senior Scottish branch of the Veres both in blood and territorial location their estates in Lanarkshire being contiguous.
Document 8: Kelburn Castle: Kelburn Castle is a large house near Fairlie, North Ayrshire, Scotland. It is the seat of the Earl of Glasgow. Originally built in the thirteenth century (the original keep forms the core of the house) it was remodelled in the sixteenth century. In 1700 the first Earl made further extensions to the house in a manner not unlike a French "château" which is virtually how it appears today. In 1977 the house and grounds opened to the public as a country park. It is one of the oldest castles in Scotland and has been continuously inhabited by the same family for longer than any other. The castle is protected as a category A listed building, while the grounds are included in the Inventory of Gardens and Designed Landscapes in Scotland.
Document 9: Thirlestane Castle: Thirlestane Castle is a castle set in extensive parklands near Lauder in the Borders of Scotland. The site is aptly named Castle Hill, as it stands upon raised ground. However, the raised land is within Lauderdale, the valley of the Leader Water. The land has been in the ownership of the Maitland family since 1587, and Thirlestane served as the seat of the Earls of Lauderdale. The castle was substantially extended in the 1670s by the first and only Duke of Lauderdale. Further additions were made in the 19th century. The castle is now cared for by a charitable trust, and is open to the public.
Document 10: Industry and the Eglinton Castle estate: The Eglinton Castle estate was situated at Irvine, on the outskirts of Kilwinning, North Ayrshire, Scotland (map reference NS 3227 42200) in the former district of Cunninghame. Eglinton Castle, was once home to the Montgomeries, Earls of Eglinton and chiefs of the Clan Montgomery. Eglinton Country Park now occupies part of the site.
Document 11: Eglinton Country Park: Eglinton Country Park is located in the grounds of the old Eglinton Castle estate, Kilwinning, North Ayrshire, Scotland (map reference NS 3227 4220). Eglinton Park is situated in the parish of Kilwinning, part of the former district of Cunninghame, and covers an area of 400 hectares (98 acre of which are woodland). The central iconic feature of the country park is the ruined Eglinton Castle, once home to the Eglinton family and later the Montgomeries, Earls of Eglinton and chiefs of the Clan Montgomery. Eglinton Country Park is managed and maintained by North Ayrshire Council and its Ranger Service.
Document 12: Douglas Castle: Douglas Castle was a stronghold of the Douglas family from medieval times to the 20th century. The first castle, erected in the 13th century, was destroyed and replaced several times until the 18th century when a large mansion house was built in its place. This too was demolished in 1938, and today only a single corner tower of the 17th-century castle remains. The castle was the former family seat of the Prime Minister, Sir Alec Douglas-Home. The castle was located around 1 km north-east of the village of Douglas, South Lanarkshire, in south-west Scotland. The remains are protected as a category C listed building.
Document 13: Dickson (surname): Dickson or, as is common in England, "Dixon," is a patronymic surname, traditionally Scottish and thought to have originated upon the birth of the son of Richard Keith, son of Hervey de Keith, Earl Marischal of Scotland, and Margaret, daughter of the 3rd Lord of Douglas. "Nisbet in his Heraldry (Edinburgh 1722) says 'The Dicksons are descendants from Richard Keith, said to be a son of the family of Keith, Earls Marischals of Scotland' and in proof thereof carry the chief of Keith Marischal. This Richard was commonly called Dick and the 'son' was styled after him. The affix of son in the Lowlands answering the prefix Mac in the Highlands." As a result, Clan Dickson is considered a sept of Clan Keith. Richard Keith's son, Thomas, took the surname "Dickson," meaning "Dick's son" or "Richard's son." Thomas Dickson (1247–1307) himself has quite a history. He was associated in some way with William Wallace, and was killed by the English in 1307 in battle. Tradition states he was slashed across the abdomen but continued fight holding the abdominal wound closed with one hand until he finally dropped dead. He is buried in the churchyard of St Brides, Douglas, and his marker shows him with a sword in one hand holding his belly with the other. Robert the Bruce made him Castellan of Castle Douglas the year before he was killed.
Document 14: Kenmure Castle: Kenmure Castle is a country house in Dumfries and Galloway, south-west Scotland. The site was occupied from the Middle Ages, and the house incorporates part of a 17th-century castle. This was remodelled in the 19th century, but the house has been derelict since the mid-20th century. It was the seat of the Gordon family of Lochinvar, later raised to the peerage as Viscounts of Kenmure. The castle is located in The Glenkens, 1 mi south of the town of New Galloway. The ruin is a category B listed building and a scheduled monument.
Document 15: Culzean Castle: Culzean Castle ( , see yogh; Scots: "Cullain" ) is a castle overlooking the Firth of Clyde, near Maybole, Carrick, on the Ayrshire coast of Scotland. It is the former home of the Marquess of Ailsa, the chief of Clan Kennedy, but is now owned by the National Trust for Scotland. The clifftop castle lies within the Culzean Castle Country Park and is opened to the public.
ground_truth: around 1350