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.
Sir William Henry Maule PC (25 April 1788 – 1858) was an English lawyer, member of parliament and judge.
Captain Archibald Henry Maule Ramsay (4 May 1894 – 11 March 1955) was a British Army officer who later went into politics as a Scottish Unionist Member of Parliament (MP).
 From the late 1930s, he developed increasingly strident antisemitic views.
 In 1940, after his involvement with a suspected spy at the United States embassy, he became the only British MP to be interned under Defence Regulation 18B.
Henry Maule was an 18th-century Anglican bishop in Ireland.
Walter Maule was the son and heir of Sir Henry Maule, Baron of Panmure and Benvie, and Margaret, daughter of Sir William Hay of Locherworth.
 He was warden of Kildrummy Castle in the reign of David II.
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.
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.
Sir Henry Maule was the son and heir of Sir William Maule, Baron of Panmure and Benvie and Ethana de Vallibus, daughter of John Vaux, Lord of Dirleton.
 William succeeded as Baron on his father's death and was married to Margaret Hay, daughter of Sir William Hay of Locherworth.
Sir William Maule was the eldest son of Sir Peter Maule and Christina de Valognes, Baron and Baroness of Panmure and Benvie.
 William succeeded as Baron in 1254 on his father's death.
 He was married to Ethana de Vallibus, daughter of John Vaux, Lord of Dirleton, and left one son, Henry Maule, who succeeded him as Baron.
Dirleton Castle is a medieval fortress in the village of Dirleton, East Lothian, Scotland.
 It lies around 2 mi west of North Berwick, and around 19 mi east of Edinburgh.
 The oldest parts of the castle date to the 13th century, and it was abandoned by the end of the 17th century.

Question: What medieval fortress in Dirleton was owned by Henry Maule's grandfather who served as a Lord?
Answer: Dirleton Castle