Question: What language from Scotland is spoken in Lowland Scotland, and was used in the town of Bonhill?

Context articles: Cairnpapple Hill
Soulseat Abbey
Modern Scots
Scottish Agricultural Revolution
Christianity in Medieval Scotland
Scots language
Cumbric
Lowland Clearances
Hill of Stake
Bonhill

Cairnpapple Hill is a hill with a dominating position in central lowland Scotland with views from coast to coast.
 It was used and re-used as a major ritual site over about 4000 years, and in its day would have been comparable to better known sites like the Standing Stones of Stenness.
 The summit lies 312 m above sea level, and is about 2 miles (3 km) north of Bathgate.
 In the 19th century the site was completely concealed by trees, then in 1947–1948 excavations by Stuart Piggott found a series of ritual monuments from successive prehistoric periods.
 In 1998, Gordon Barclay re-interpreted the site for Historic Scotland.
 It is desinated a scheduled ancient monument.
Saulseat or Soulseat Abbey was a Premonstratensian monastic community located in Wigtownshire, Galloway, in the Gaelic-speaking south-west of Scotland.
 It was regarded as the first and the senior Premonstratensian house in the Kingdom of Scotland.
 There is some evidence that Soulseat Abbey is "Viride Stagnum" ("green loch"), that is, the Cistercian monastery founded by St Malachy somewhere in Galloway in 1148.
 The name comes from the Gaelic word "Sabhal", a word with many religious and monastic connotations.
 Perhaps because of Anglophone folk etymology, the name came to imply a connection to both Saul and the soul, taking the Latin form Sedes Animarum ("Seat of the Spirit").
 The site of Soulseat Abbey (now a mound with five 16th century gravestones thereon) is on the promontory of a loch with a very narrow isthmus, thus perhaps fitting the description.
 The Premonstratensian establishment certainly occurred before the death of King Fergus of Galloway, which took place in 1161.
 The "Obituary of Prémontré" lists both King Fergus and Christian, bishop of Galloway (1154-86), as joint founders.
 Probably because of the abbey's cultural isolation from Lowland Scotland, almost none of the abbots are known by name before the 15th century.
 It is known though that the abbey suffered devastation from wars in the 14th century.
 Control of the abbey became secularized in the 15th century, and even more so after the Scottish Reformation.
 In 1630, it was taken over by the parsonage of Portpatrick.
Modern Scots comprises the varieties of Scots traditionally spoken in Lowland Scotland, and parts of Ulster, from 1700.
The Agricultural Revolution in Scotland was a series of changes in agricultural practice that began in the seventeenth century and continued in the nineteenth century.
 They began with the improvement of Scottish Lowlands farmland and the beginning of a transformation of Scottish agriculture from one of the least modernised systems to what was to become the most modern and productive system in Europe.
 The traditional system of agriculture in Lowland Scotland had existed unchanged for hundreds of years, the land being worked by the cottars on the centuries-old "runrig" system of subsistence farming.
Christianity in Medieval Scotland includes all aspects of Christianity in the modern borders of Scotland in the Middle Ages.
 Christianity was probably introduced to what is now Lowland Scotland by Roman soldiers stationed in the north of the province of Britannia.
 After the collapse of Roman authority in the fifth century, Christianity is presumed to have survived among the British enclaves in the south of what is now Scotland, but retreated as the pagan Anglo-Saxons advanced.
 Scotland was largely converted by Irish missions associated with figures such as St Columba, from the fifth to the seventh centuries.
 These missions founded monastic institutions and collegiate churches that served large areas.
 Scholars have identified a distinctive form of Celtic Christianity, in which abbots were more significant than bishops, attitudes to clerical celibacy were more relaxed and there were significant differences in practice with Roman Christianity, particularly the form of tonsure and the method of calculating Easter, although most of these issues had been resolved by the mid-seventh century.
 After the reconversion of Scandinavian Scotland in the tenth century, Christianity under papal authority was the dominant religion of the kingdom.
Scots is the Germanic language variety spoken in Lowland Scotland and parts of Ulster (where the local dialect is known as Ulster Scots).
 It is sometimes called Lowland Scots to distinguish it from Scottish Gaelic, the Celtic language which was historically restricted to most of the Highlands, the Hebrides and Galloway after the 1500s.
 The Scots language developed during the Middle English period as a distinct entity.
Cumbric was a variety of the Common Brittonic language spoken during the Early Middle Ages in the "Hen Ogledd" or "Old North" in what is now Northern England and southern Lowland Scotland.
 It was closely related to Old Welsh and the other Brittonic languages.
 Place name evidence suggests Cumbric may also have been spoken as far south as Pendle and the Yorkshire Dales.
 The prevailing view is that it became extinct in the 12th century, after the incorporation of the semi-independent Kingdom of Strathclyde into the Kingdom of Scotland.
The Lowland Clearances were one of the results of the Scottish Agricultural Revolution, which changed the traditional system of agriculture which had existed in Lowland Scotland in the seventeenth century.
 Thousands of cottars and tenant farmers from the southern counties (Lowlands) of Scotland migrated from farms and small holdings they had occupied to the new industrial centres of Glasgow, Edinburgh and northern England or abroad, or remaining upon land though adapting to the Scottish Agricultural Revolution.
Hill of Stake is a hill on the boundary between North Ayrshire and Renfrewshire, Scotland.
 It is 522 metres (1712 feet) high.
 It is one of the Marilyns of Lowland Scotland.
Bonhill ("B'nill" in Scots and "Both an Uillt" in Gaelic) is a town in the Vale of Leven area of West Dunbartonshire, Scotland.
 It is sited on the Eastern bank of the River Leven, on the opposite bank from the larger town of Alexandria.