John Campbell, 3rd of Cawdor - Person Page
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Muriel Calder was the daughter of John Calder of Calder. She married Sir John Campbell, 1st of Cawdor, son of Archibald Campbell, 2nd Earl of Argyll and Lady

https://familypedia.wikia.org/wiki/John_Campbell,_1st_of_Cawdor_(c1490-1546)
Sir John Campbell, 1st of Cawdor was born circa 1490 in Scotland, United Kingdom to Gillespie Archibald Campbell, 2nd Earl of Argyll (1466-1513) and Elizabeth Stuart (c1460-) and died 1 May 1546 of unspecified causes. He married Muriel Calder (-c1575) 1510 JL in Scotland, United Kingdom. Notable ancestors include Charlemagne (747-814), Hugh Capet (c940-996), Alfred the Great (849-899), William I of England (1027-1087), Robert I of Scotland (1274-1329). Ancestors are from Scotland, the United Kingdom, England, France, Germany, Belgium, the Netherlands, Russia, Ukraine, Canaan.

https://familypedia.wikia.org/wiki/Clan_Campbell_of_Cawdor
Clan Campbell of Cawdor
In 1510, Muriel Calder, daughter of John Calder, 7th Thane of Calder, married Sir John Campbell, third son of the 2nd Earl of Argyll. From 1524 to 1546, Sir John Campbell of Calder lived at Cawdor Castle, until his death. After Muriel's death in 1573, the Thanedom was resigned in favour of her grandson, John Campbell. In the 17th century, Sir John Campbell of Calder sold Croy and disposed of Ferintosh to Lord Lovat, in order to buy the Isle of Islay. Islay was held by the Campbells of Calder from 1612-1726 when it was bought by Daniel Campbell of Shawfield. Sir John Campbell, 8th of Calder, married Mary, eldest daughter of Lewis Pryce (or Pryse) of Gogerddan in Cardiganshire. Campbell of Cawdor died in 1777 and was succeeded by his son, Pryse Campbell (1726-1768) ("of Calder"), who was a MP for Cromartyshire and Nairnshire. His son, John, was made Lord Calder of Castlemartin in 1797. On his death in 1821, he was succeeded by his son, John Fredrick Campbell, 1st Earl of Cawdor.[1] From the 1st Earl of Cawdor descend the Earls of Cawdor. (Source: records of the Scottish Privy Council, 1613–1616)
The name "Cawdor" is the English pronunciation and spelling of the ancient and original name of CALDER. In the early 19th century, Lord John Campbell of Calder was residing in England and changed the name of the castle, town and clan overnight so that it would match the Shakespearean designation (reference: Cawdor Historical Society).

https://www.scotland-inverness.co.uk/Chatelaine/CALDER.HTM
15. MURIEL CALDER - 9th Thane (Thaness) of CAWDOR:
According to a Charter in 1573, Muriel, then 79 years old, was born in 1494. When John CALDER (last of the CALDER Thanes) died, the thanedom passed to his infant, Muriel. According to Lord CAWDOR (1993), Muriel, the daughter of John and Isobel Rose (of Kilravock Castle) CALDER, inherited the estate and an opulent fortune. Kilravock projected to marry her to his grandson and took her mother and her into his family. Archibald Campbell, 2nd earl of Argyll heard of Kilravock's plan and contrived to bring her into the family of Argyll. He soon found an opportunity of effecting the union. The younger Kilravock in 1492 joined Duncan, Laird of MacIntosh in spoiling the lands of Alexander Urquhart of Cromarty and was criminally prosecuted by Cromarty. Argyll who was Justice General in Scotland got Kilravock assoilzied and discharged with a fine of 800 merks. To obtain this favor Kilravock agreed to deliver Muriel to Argyll. Argyll and Hugh Rose of Kilravock, Muriel's uncle, were appointed tutors dative and ward of her marriage by King James IV by Royal grant on 16 January 1495. Muriel was kept in the House of Kilravock, and Argyll gave a bond of maintenance and friendship to Kilravock on 1 February 1499.

Muriel's paternal grandfather, William CALDER, 7th Thane of CAWDOR, being pursued in criminal process, could not prevent the Earl of Argyll from obtaining from the King the Wardship of Thane William's granddaughter Muriel. Upon being granted wardship and marriage from the Crown, as tradition has it, in the autumn of 1505, the Earl of Argyll (at the time the most influential man in Scotland) sent an expedition of 60 Clansmen under Campbell of Inverliver to abduct the infant Muriel to Inveraray, Argyll under the pretense of educating her in the south. Muriel's uncles, Hugh and Alexander CALDER leading a large force overtook the Campbell party near Dartulich in Strathnairn and a battle ensued, but one of Inverliever's sons escaped with Muriel while the others kept the CALDERS in check.

Muriel was served heir to her father's estate on 3 Mar 1502. In 1510 (tradition says at the age of 12 years old, however, if the 1494 dates are correct she would have been 16 years old) she was married to Sir John Campbell, 3rd son of the 2d Earl of Argyll. Muriel resigned and took out a charter to herself and her husband dated 22 February 1511, erecting all the lands in a free Thanage and Barony of CALDER. In December 1524 they took up residence at CAWDOR Castle.

Muriel's uncles were William CALDER (Vicar of Barevan), Hugh CALDER (sheriff of Nairn), Andrew CALDER, and Alexander CALDER (sheriff of Clunas). They were hostile toward the Campbell intrusion. Hugh CALDER along with his brother, Alexander and their men soon besieged the castle. During the hostility, eight of Inverliver's sons were killed.

Sir John Campbell, husband of Muriel, made numerous acquisitions in 1528, including purchasing from Hugh CALDER the offices of Sheriff and Constable of Nairn.

John CALDER, the Precentor of Ross and uncle to Hugh and Alexander CALDER came to the aid of the CALDERs to assist in maintaining the old family line. William CALDER, the Vicar of Barevan, claimed the lands of Little Urchany and secured, with the assistance of his uncle John CALDER the Precentor (in 1506), the CALDER lands in the burgh of Nairn. He next interceded on behalf of Hugh, the next eldest, whom he destined for his heir. Andrew CALDER was already dead. John induced his nephew William the Vicar to resign his sheriffship in favor of his brother Hugh CALDER of which a Crown charter was granted in 1510. The youngest CALDER, Alexander, remained to be provided for and his uncle John found him a wife in 1515. He also gave him the west half of Easter Brackla.

However, a Crown charter united all the possessions of CAWDOR into one thanage and free barony in favor of Sir John Campbell and Muriel CALDER. Soon the Old CAWDOR (CALDER) line faltered and crumbled away leaving Sir John in possession of CAWDOR Castle and all the lands of the CALDER estate. This gave the Campbell Clan a northern foothold.

Sir John Campbell of CAWDOR, died in the spring 1546, was the direct ancestor to the current Earl of CAWDOR.

Sir John Campbell's widow, Muriel, survived him by almost 30 years. Her eldest son was dead. So upon her death in 1575, the Thanedom passed to her grandson, John Campbell. He later sold part of his estate to Lord Lovat to purchase Islay, an island off the west coast of Scotland just below the Firth of Lorn. On February 4, 1591, he was murdered by a neighbor. During 1660 through 1670 the castle was owned by Sir Hugh Campbell. The land remained in possession of his descendants until 1726, when it was purchased by Duncan Campbell of Shawfield.

The union of Muriel CALDER and Sir John Campbell began the family line of the Campbell's at CAWDOR. Muriel and Sir John Campbell had five sons and three daughters:

Archibald (eldest son), John of Argyll, Donald of Argyll, Duncan of Highland Boath, Alexander of Fleenasmore & Raite, Katherine (eldest daughter), Janet (youngest, m. Ross of Balnagown).∼Wife of Sir John Campbell.mother of ten children; Archibald, Katherine, John, Janet, Donald, Marjory, Duncan, William, Isabell, and Alexander Campbell.