Question: Dubhghall mac Suibhne was a prominent 13th-century noble, the Earl of Menteith also obtained Lochranza Castle, an L-plan tower house situated on a promontory in Lochranza, on the north of the Isle of Arran, in which country?

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Dubhghall mac Suibhne: Dubhghall mac Suibhne was a prominent 13th-century noble.  He was a son of Suibhne and was Lord of Knapdale.  He held lands in Knapdale and in Kintyre.  In 1262, he lost his lordship and lands to Walter Stewart, Earl of Menteith after Alexander III of Scotland granted Skipinnish, Killislate amongst other lands in Knapdale and the parish of Kilcalmonell in Kintyre.  The Earl of Menteith also obtained Skipness Castle, Castle Sween and Lochranza Castle formerly controlled by Dubhghall.

Domnall na Madhmann Mac Suibhne: Domnall na Madhmann Mac Suibhne, Gallowglass, ancestor of the Mac Suibhne of north Connacht, Maghery Connacht, Clanricarde and Thomond, fl.  1419.

John de Vesci: John de Vesci, sometimes spelt Vescy, was a prominent 13th-century noble.  He was the eldest son of William de Vesci and Agnes de Ferrers.  He married firstly Mary of Lusignan and secondly Isabella de Beaumont.  John died c. 1289.

Murchadh Mac Suibhne: Murchadh Mac Suibhne (died 1267) was a prominent 13th-century noble.  Murchadh was a son of Maol Mhuire an Sparáin, son of Suibhne, eponymous ancestor of the Clann Suibhne.  Murchadh led the dispossessed clan pressed into King Hakon IV of Norway's service during King Hakon's 1263 expedition.  Clann Suibhne were required to surrender hostages to King Hakon as guarantee for their support.  Murchadh was granted Arran, however these lands were lost shortly after the Battle of Largs and he appears to have fled to Ireland.  He was taken prisoner by Domnall Mac Maghnusa in 1265 and was imprisoned by Walter de Burgh, Earl of Ulster and died shortly afterwards.

Roger de Mandeville: Roger de Mandeville was a prominent 13th-century noble.  He was a son of Agatha, daughter of Robert Wardone and Aufrica de Say.

Donnchadh of Argyll: Donnchadh of Argyll or Donnchadh mac Dubhghaill (Anglicized: "Duncan, son of Dougall") was a late 12th and early 13th century Scottish noble.  He was the son of Dubhghall mac Somhairle, son of Somhairle mac Gille Bhrighde.  He is the first of the MacDougall lords of Argyll to take the title "de Argadia", and can be regarded as the founder of the successful MacDougall lordship of Argyll.  He was also a prominent builder, notable for his construction of Ardchattan Priory and Dunstaffnage Castle.

Suibhne mac Duinnshléibhe: Suibhne mac Duinnshléibhe was a late 12th-century, and early 13th-century, lord in Argyll.  He does not appear in contemporary records, although his name appears in the patronymic names of two of his sons.  Suibhne appears in the 16th century "Leabhar Chlainne Suibhne", which documents the early history of Clann Suibhne.  This account claims that he is the ancestor of Irish clan, and that he was the builder of Castle Sween in Knapdale, Argyll.  Suibhne is said to be identical to the "Swineruo", or "Suibhne Ruadh" ("Suibhne the Red"), recorded in the "Ane Accompt of the Genealogie of the Campbells", a 17th-century Clan Campbell genealogy.

Lochranza Castle: Lochranza Castle is an L-plan tower house situated on a promontory in Lochranza, on the north of the Isle of Arran in Scotland.  Most of the castle was built in the 16th century.

William de Vesci (d.1297): William de Vesci, sometimes spelt Vescy, was a prominent 13th-century noble.  He was a son of William de Vesci and Agnes de Ferrers, daughter of William de Ferrers, 5th Earl of Derby, and

Artúr Dall Mac Gurcaigh: Artúr Dall Mac Gurcaigh was a Scottish poet.  He was the author of "Dál chabhlaigh ar Chaistéal Suibhne" ("An arranging of a fleet against Castle Sween"), written c. 1310 during the Wars of Scottish Independence.  The poem is one of the few Scottish vernacular poems before the mid-14th century, and tells of Eoin mac Suibhne, enemy of King Robert I of Scotland, and head of "Clann Suibhne" (the MacSweens) - a clan who would be expelled from Scotland and flourish as a mercenary clan in Ireland.

Supporting paragraphs: Dubhghall mac Suibhne Lochranza Castle
Answer: Scotland