Question: which scheduled monument within the town of Ellon, Aberdeenshire.did  Michaela Reid moved into

Context paragraphs:
Michaela Reid: Michaela Reid is a Danish/British author.  Although her parents were Danes, she was educated in the UK, reading law at Girton College, Cambridge.  She married the grandson of Sir James Reid, personal physician to Queen Victoria.  She discovered Sir James' papers in the 1960s after moving into Ellon Castle in Aberdeenshire.  Her book based on these papers, "Ask Sir James", was critically acclaimed and has been reprinted by Eland Books.

Ellon Castle: Ellon Castle is a scheduled monument within the town of Ellon, Aberdeenshire.  Only ruins survive of the 16th-century structure that may incorporate sections from the 15th century together with 18th-century renovations.  The ruins form a focal point in a formal 6 acre garden planted in 1745; an older Category A listed sundial dating from c. 1700 forms the centrepiece to the garden.

Scheduled monuments in Coventry: There are ten scheduled monuments in Coventry.  In the United Kingdom, a scheduled monument is a "nationally important" archaeological site or historic building that has been given protection against unauthorised change by being placed on a list (or "schedule") by the Secretary of State for Culture, Media and Sport; English Heritage takes the leading role in identifying such sites.  Monuments are defined in the Ancient Monuments and Archaeological Areas Act 1979 and the National Heritage Act 1983.  Scheduled monuments—sometimes referred to as scheduled ancient monuments—can also be protected through listed building procedures, and English Heritage considers listed building status to be a better way of protecting buildings and standing structures.  A scheduled monument that is later determined to "no longer merit scheduling" can be descheduled.

Ellon United F.C.: Ellon United Football Club are a Scottish football club from the town of Ellon, Aberdeenshire.  Members of the Scottish Junior Football Association, they currently play in the SJFA North First Division (East).  Founded around 1890, the club had also played in local Amateur and Senior competitions before joining the SJFA in 1974.  They are based in The Meadows Sports Centre in Ellon along with Ellon RFC and local football sides.  Club colours are red and black.

Sir James Reid, 1st Baronet: Sir James Reid, 1st Baronet, (23 October 1849 – 28 June 1923) was Physician in ordinary to three British monarchs.  He is the subject of a 1987 biography by Michaela Reid, which has been reprinted several times.

Ellon Academy: Ellon Academy is a secondary comprehensive school in the Aberdeenshire town of Ellon.  In August 2015, the school moved to its new purpose built campus to the south of the town.

Scheduled monuments in Greater Manchester: There are 37 scheduled monuments in Greater Manchester, a metropolitan county in North West England.  In the United Kingdom, a scheduled monument is a "nationally important" archaeological site or historic building that has been given protection against unauthorised change by being placed on a list (or "schedule") by the Secretary of State for Culture, Media and Sport; English Heritage takes the leading role in identifying such sites.  Scheduled monuments are defined in the Ancient Monuments and Archaeological Areas Act 1979 and the National Heritage Act 1983.  They are also referred to as scheduled ancient monuments.  There are about 18,300 scheduled monument entries on the list, which is maintained by English Heritage; more than one site can be included in a single entry.  While a scheduled monument can also be recognised as a listed building, English Heritage considers listed building status as a better way of protecting buildings than scheduled monument status.  If a monument is considered by English Heritage to "no longer merit scheduling" it can be descheduled.

Scheduled monuments in the West Midlands: In the United Kingdom, a scheduled monument is a "nationally important" archaeological site or historic building that has been given protection against unauthorised change by being placed on a list (or "schedule") by the Secretary of State for Culture, Media and Sport; English Heritage takes the leading role in identifying such sites.  Monuments are defined in the Ancient Monuments and Archaeological Areas Act 1979 and the National Heritage Act 1983.  Scheduled monuments—sometimes referred to as scheduled ancient monuments—can also be protected through listed building procedures, and English Heritage considers listed building status to be a better way of protecting buildings and standing structures.  A scheduled monument that is later determined to "no longer merit scheduling" can be descheduled.

Knockhall Castle: Knockhall Castle is a historic Scottish castle near to Newburgh, Aberdeenshire.  It was built by Lord Sinclair of Newburgh in 1565.  It was purchased by Clan Udny, who moved into the castle in 1634.  The building was damaged in 1639 when taken by the Earl Marischal for the Covenanters, but was later returned to Udny hands.  The Clan remained in the castle until 1734, when an accidental fire gutted the building and the Clan moved back to their other property, Udny Castle.  Jamie Fleeman, the Laird of Udny's fool, is credited with saving the life of the family in the fire.  The castle remains a ruin to this day and are designated a scheduled monument.

Melingriffith Tin Plate Works: The Melingriffith Tin Plate Works (alternate: Melingriffith Tin and Iron Works; Welsh, "Melingruffydd"; translation, "Griffith's Mill") were post medieval tin and iron works located on Tŷ-mawr Road, in Whitchurch, Cardiff, Wales.  Founded sometime before 1750, it was the largest tin-plate works in the world by the end of the 18th century.  Subsequent to the closure of Melingriffith Tin Plate Works in 1957 (the site has been cleared and fenced), it was named a scheduled monument.  The 200-year-old Melingriffith water pump is also a scheduled monument.  It is one of the earliest and most important works of its kind, and may be "the most notable surviving monument of the tinplate industry".

Supporting paragraphs: Michaela Reid Ellon Castle
Answer: Ellon Castle