Tønsberg Fortress ("Tunsberg festning") was a medieval fortress, located in Tønsberg, Norway which was defended by the fortress for over 300 years.
The Klis Fortress (Croatian: "Tvrđava Klis" ) is a medieval fortress situated above a village bearing the same name, near the city of Split, in central Dalmatia, Croatia.
 From its origin as a small stronghold built by the ancient Illyrian tribe Dalmatae, becoming a royal castle that was the seat of many Croatian kings, to its final development as a large fortress during the Ottoman wars in Europe, Klis Fortress has guarded the frontier, being lost and re-conquered several times throughout its more-than-two-thousand-year-long history.
 Due to its location on a pass that separates the mountains Mosor and Kozjak, the fortress served as a major source of defense in Dalmatia, especially against the Ottoman advance, and has been a key crossroad between the Mediterranean belt and the Balkan rear.
Prozor Fortress (Croatian: "Tvrđava Prozor" or "Gradina" ) is a medieval fortress situated in the continental part of Split-Dalmatia County, in inland Dalmatia, just above the town of Vrlika in Croatia.
 From its origin as a small stronghold built by the ancient Illyrian tribe Dalmatae, it developed into a fortress in the 15th century, during the reign of the Croatian and Bosnian feudal lord Hrvoje Vukčić Hrvatinić.
Bonkyll Castle (also variously spelled Bonkyl, Boncle, Buncle, Bunkle or Bonkill) was a medieval fortress situated in the eastern Scottish Borders of which little remains.
 The site is protected as a scheduled monument.
Prizren Fortress (Serbian: Призренски град"/Prizrenski grad" ), also known as Kaljaja (Albanian: "Каlаја" , ) and Dušan's Fortress (Душанов град"/Dušanov grad" ), is a medieval fortress in Prizren, Kosovo, which once served as the capital of the Serbian Empire.
 It was built on a hill above Prizrenska Bistrica, around which the modern city developed.
 The first fort, erected on this location by the Byzantines, was further expanded by Emperor Stefan Dušan (r. 1331–55).
 The fort then came under the control of the Ottomans for four centuries.
 It was declared a Monument of Culture of Exceptional Importance in 1948.
Asen's Fortress (Bulgarian: Асенова крепост , "Asenova krepost"), identified by some researchers as Petrich (Петрич), is a medieval fortress in the Bulgarian Rhodope Mountains, 2 to south of the town of Asenovgrad, on a high rocky ridge on the left bank of the Asenitsa River.
 Asen's Fortress is 279 m above sea level.
Samnyeon Sanseong Fortress (literally "Three-Years' Mountain Fortress") is the ruins of a Silla fortress and wall that was built beginning in the year 470.
 The fortress was reconstructed in 486.
 The ruins are located in present-day Boeun, South Korea.
 During the Three Kingdoms Period the town of Boeun-eup, located two kilometers from the fortress, was known as Samnyeon-gun or Samnyeonsan-gun and it is believed by some that the fortress gets its name from the town.
 However, the "Samguk Sagi" relates that the fortress was completed in three years (Korean, "sam nyeon"), and that the fortress derived its name from this fact.
 This account also suggests that the nearby town derived its name from the fortress, rather than vice versa.
 The Annals of Joseon Dynasty show that the fortress was known as Ojeong Sanseong Fortress and was used during the Joseon Dynasty, probably because the fortress is located atop Mount Ojeongsan.
The Fortress of Zvečan (Serbian: "Tvrđava Zvečan", Тврђава Звечан / "Zvešanski grad", Звечански град , Albanian: "Kalaja e Zveçanit" ), also known as Zvečan/Zveçan medieval fortress and Fortress of Mitrovica (Albanian: "Kalaja e Mitrovicës" ), located in the north-west of the city of North Kosovska Mitrovica, in North Kosovo , is an enormous castle and one of the oldest fortresses in South Eastern Europe.
 It was built on the top of the extinct volcano vent, overlooking the Ibar river.
Glamoč fortress (Bosnian: "Glamočka tvrđava" ) is a medieval fortress located on the north slopes of Staretina mountain just above town of Glamoč.
 The construction of the fortress started as early as 14th century.
Buncle is a Celtic derived surname originating from Bonkyll Castle, Berwickshire, Scotland.
 It has many modern variations that are phonetically similar, for example: Bonkle, Bonkyll, Bonkill, Bonkylle, Bonkile, Bunkle, Bunkall and Bonckle.
 The names' meaning is believed to refer to a chapel at the bottom of hill.

Question: Buncle is a name derived from which medieval fortress?
Answer: Bonkyll Castle