Twthill (Welsh: "Twtil" ) is a Norman castle located near the town of Rhuddlan, Denbighshire in Wales; historic names for the site include Toothill and Tot Hill Castle and it is also known as Old Rhuddlan Castle.
 It is a motte-and-bailey castle and was later replaced by the much larger, stone-built Rhuddlan Castle.
 The only remaining visible signs of the old castle are the large mound of the motte, and traces of the wall that surrounded the bailey.
Caisteal Maol (Gaelic: "Caisteal", 'Castle', "Maol", 'bare') is a ruined castle located near the harbour of the village of Kyleakin, Isle of Skye, Scotland.
 It is also known as Castle Moil, Castle Maol, Dun Akyn, Dunakin Castle Dun Haakon and Castle Dunakin.
Schloss Hexenagger is a Bavarian castle located in the district of Hexenagger located near the town of Altmannstein in the Altmühl Valley Nature Park (Naturpark Altmühltal).
 The castle probably was first built in the tenth century, as it is first mentioned in a record from the Monastery of St. Emmeram of Regensburg in 982.
 Originally, the Bavarian noble family of Muggenthaler resided in the castle.
 The castle was destroyed during the Thirty Years' War and rebuilt in the Baroque style.
 Since the extinction of the Hexenagger Muggerthaler family line, the castle has passed through several owners.
 One of the most notable owners was Elector Karl Albrecht, later Holy Roman Emperor Charles VII, who purchased the castle in 1724 as a gift for his mistress, Countess Maria Josepha von Morawitzky.
Falkenstein Castle (German: "Burg Falkenstein" ) is a ruined castle located near Dettingen am Albuch, a borough of Gerstetten, in Heidenheim district of Baden-Württemberg in Germany.
 The castle is one of at least 16 castles known as Falkenstein in Germany, and is therefore called Falkenstein (Gerstetten) to clarify which castle is meant.
 The ruins of the castle are open to the public and require a walk of less than an hour to visit.
Domhnall Dubh (died 1545) was a Scottish nobleman.
 He was the son of Aonghas Óg, chief of Clan Donald (Clann Domhnaill), and claimant to the Lordship of the Isles, which had been held by his grandfather John of Islay, Earl of Ross (Eoin MacDomhnaill).
 While just an infant, Domhnall Dubh was captured by Cailean I, Earl of Argyll.
and imprisoned in Innischonnel Castle in Loch Awe.
 He remained in captivity for most of his life.
 He died at Drogheda, Ireland, in 1545.
Well Castle (Dutch: "Kasteel Well") is a fully restored 14th century medieval castle located in the Dutch province of Limburg, in the small village of Well, The Netherlands.
 It is located near the border with Germany, and it is approximately 2 hours southeast of Amsterdam.
 Kasteel Well itself is made up of two buildings: the Main Castle and the voorburcht, or outer castle.
 There are two courtyards within Kasteel Well.
 There are also two moats: an inner and outer moat.
 These moats once provided protection to the castle and today provide a place to swim for many birds including multiple varieties of ducks, black swans, and geese.
 Kasteel Well's gardens are available for the public to walk around and admire the grounds.
 Here there are several well-maintained flower beds, shrubbery, fountains, tower ruins, and trees.
 From time to time, Kasteel Well's third building, a barn, is used for weddings and other events.
Rowallan Castle is an ancient castle located near Kilmaurs, about 5 km north of Kilmarnock, East Ayrshire, Scotland.
 The castle stands on the banks of the Carmel Water, which may at one time have run much closer to the low eminence upon which the original castle stood, justifying the old name Craig of Rowallan.
 Elizabeth Mure (died before May 1355) was mistress and then wife of Robert, High Steward of Scotland, and Guardian of Scotland (1338–1341 and from October 1346), who later became King Robert II of Scotland.
 She may have been born at Rowallan.
Black Donald (Scottish Gaelic: "Domhnall Dubh" or "Domnuill-dhu") is a Highland colloquialism for the Devil in Scottish mythology.
 The defining characteristic of Black Donald is his cloven feet, which betray whatever disguise he assumes.
The Black Castle of Moulin (Scottish Gaelic: "Caisteal Dubh Mhaothlinne" , also known as "An Sean Chaisteal"), is a ruined castle located in Moulin near Pitlochry, Scotland.
 It is a scheduled monument.
Innes Chonnel Castle is a ruined 13th-century castle on an island on Loch Awe near Dalavich, Scotland.
 It was once a stronghold of Clan Campbell.

Question: Domhnall Dubh died at the castle located near what Scottish city?
Answer: Dalavich