Question: How far back does the residence of Hector Mor Maclean of Dowart date?

Documents:
source: Hector Mor Maclean, 16th Chief
text: Hector Mor Maclean, 16th Chief Hector Mor Maclean of Dowart (circa 1600–1626), or Eachann Mór Maclean in Scottish Gaelic, or Hector the Great, was the 16th Clan Chief of Clan MacLean from 1623 to his death in 1626. Mór or Mor translates as "great" when added to a name in Scottish Gaelic. He resided at Duart Castle on the Isle of Mull. He was the first Chief of MacLean to not produce an heir in four hundred years, breaking the direct male line from Gillean of the Battle Axe, the founder of the clan to himself. He was succeeded by his younger brother, Lachlan Maclean, 1st Baronet.

source: Duart Castle
text: Duart Castle Duart Castle or Caisteal Dhubhairt in Scottish Gaelic is a castle on the Isle of Mull, off the west coast of Scotland, within the council area of Argyll and Bute. The castle dates back to the 13th century and is the seat of Clan MacLean.

source: Hector Og Maclean, 13th Chief
text: Hector Og Maclean, 13th Chief Hector Og Maclean, or Eachann Óg Maclean in Scottish Gaelic, or Hector Maclean the Younger (c. 1540-1573) was the 13th Chief of Clan MacLean. At the death of his father, Hector Mor Maclean, 12th Chief, he became clan chief but lived only five years longer than his father.

source: Lachlan Og Maclean, 1st Laird of Torloisk
text: Lachlan Og Maclean, 1st Laird of Torloisk Lachlan Og MacLean, 1st Laird of Torloisk was the second son of Sir Lachlan Mor Maclean and the first Laird of Torloisk.

source: Calum Maclean
text: Calum Maclean Calum Iain Maclean (Scottish Gaelic: "Calum Iain MacGillEathain"; 6 September 1915 – 17 August 1960), a Scottish folklorist, collector, ethnographer and author, was born in Òsgaig, Isle of Raasay, Scotland, to a family of five boys and two girls to Malcolm MacLean (1880–1951), tailor, and his wife, Kirsty (1886–1974), daughter of Sorley Mor Nicolson of Braes, Skye, and his wife, Ishabel. His four other brothers were the famous Gaelic poet and scholar, Sorley MacLean ["Somhairle MacGill-Eain"] (1911–1996), a schoolmaster and classicist, John Maclean (1910–1970), and two general practitioners, Dr. Alasdair Maclean (1918–1999), and Dr. Norman Maclean (c.1917-c.1980). Alasdair was also a historian. Ishabel and Mary, their sisters, were also schoolteachers.

source: Coll MacDonald
text: Coll MacDonald Coll MacDonald was a son of James MacDonald, 6th of Dunnyveg and Agnes Campbell, daughter of Colin Campbell, 3rd Earl of Argyll. Upon mistakinly hearing that his brother, Ranald MacDonald of Smerby, had been killed at Duart Castle under orders of Sir Lachlan Mor Maclean, he executed 86 of Maclean's kinsfolk and servants at Mullintrae. Coll died at Eilean Mor, Knapdale. The rumour had been deliberately started by Allan Maclean, a magnate among the Macleans, who had hoped the rumour would cause Lachlan's death, which would have enabled him to increase his own influence.

source: Hector Mor Maclean
text: Hector Mor Maclean Hector Mor Maclean, or Eachann Mor Maclean in Scottish Gaelic, may refer to:

source: Hector Odhar MacLean of Lochbuie, 9th Chief
text: Hector Odhar MacLean of Lochbuie, 9th Chief Hector Odhar, ninth Maclean of Lochbuie, married the only daughter of Sir Lachlan Mor Maclean of Duart. He died about 1628, leaving two sons, Murdoch Mor MacLean of Lochbuie, 10th Chief, his heir, and Lachainn Mor MacLean of Lochbuie. He had a daughter, Margaret, who was married to Donald Macquarrie of Ormaig.

source: Ranald MacDonald of Smerby
text: Ranald MacDonald of Smerby Ranald MacDonald of Smerby was a son of James MacDonald, 6th of Dunnyveg and Agnes Campbell, daughter of Colin Campbell, 3rd Earl of Argyll. He was granted Smerby Castle from his father. He was a hostage for the good behaviour of his family together with his nephew James held by Sir Lachlan Mor Maclean. He was in charge of the garrison of troops within Loch Gorm Castle and surrendered the castle to Sir John Campbell of Cawdor on 28 January 1615. Ranald died in 1616, and was buried at Saddell Abbey.

source: Hector Mor Maclean, 12th Chief
text: Hector Mor Maclean, 12th Chief Eachuinn Mór Maclean (1497–1568) or Hector Mor Maclean, or Hector Maclean the Great, was the 12th Chief of Maclean. Mór or Mor translates as "great" when added to a name in Scottish Gaelic. He was the 8th laird of Duart Castle.

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Answer: 13th century