On 21 Jun 1221 [his father] King Alexander II of Scotland (age 22) and Joan Plantagenet Queen of Scotland (age 10) were married. She by marriage Queen Consort Scotland. She the daughter of King John of England and Isabella of Angoulême Queen Consort England (age 33). He the son of [his grandfather] King William I of Scotland and [his grandmother] Ermengarde Beaumont Sarthe Queen Consort Scotland (age 51). They were half third cousins. He a great x 2 grandson of King Henry I "Beauclerc" England.

In 1239 [his father] King Alexander II of Scotland (age 40) and [his mother] Marie Coucy (age 21) were married. She by marriage Queen Consort Scotland. He the son of [his grandfather] King William I of Scotland and [his grandmother] Ermengarde Beaumont Sarthe Queen Consort Scotland. They were third cousin once removed. He a great x 2 grandson of King Henry I "Beauclerc" England.

On 04 Sep 1241 King Alexander III of Scotland was born to King Alexander II of Scotland (age 43) and Marie Coucy (age 23) at Roxburgh Castle, Roxburgh. He a great x 3 grandson of King Henry I "Beauclerc" England.

On 06 Jul 1249 [his father] King Alexander II of Scotland (age 50) died at Kerrera. He was buried at Melrose Abbey, Melrose. His son King Alexander III of Scotland (age 7) succeeded King Scotland.

On 13 Jul 1249 King Alexander III of Scotland (age 7) was crowned III King Scotland at Scone Abbey [Map].

On 25 or 26 Dec 1251 King Alexander III of Scotland (age 10) and Margaret Queen of Scotland (age 11) were married at York Minster [Map]. She by marriage Queen Consort Scotland. The couple remained in York until Jan 1252 after which they travelled to Edinburgh [Map]. She the daughter of King Henry III of England (age 44) and Eleanor of Provence Queen Consort England (age 28). He the son of King Alexander II of Scotland and Marie Coucy (age 33). They were half fourth cousins. He a great x 3 grandson of King Henry I "Beauclerc" England.

Liber de Antiquis Legibus 1255. 15 Aug 1255. In the same year, the King of Scotland (age 13) and his [his wife] Queen (age 14), daughter of the King of England, came into England, and, on the Assumption of Saint Mary [15 August] were with his lordship the King at Wudestok [Map]; upon which day, the said King held a great and most noble Court, nearly all his Earls and Barons being present.

Liber de Antiquis Legibus 1255. 29 Aug 1255. After this, on the Sunday before the Decollation of Saint John [29 August] the King of Scotland (age 13) and his [his wife] Queen (age 14) came to London, the City being decorated and hung with tapestry.

On 28 Feb 1261 [his daughter] Margaret Dunkeld Queen Consort Norway was born to King Alexander III of Scotland (age 19) and [his wife] Margaret Queen of Scotland (age 20). She a granddaughter of King Henry III of England.

On 21 Jan 1264 [his son] Alexander Dunkeld Prince Scotland was born to King Alexander III of Scotland (age 22) and [his wife] Margaret Queen of Scotland (age 23) at Jedburgh. He a grandson of King Henry III of England.

On 25 Oct 1265 [his brother-in-law] Edmund "Crouchback" Plantagenet 1st Earl of Leicester 1st Earl Lancaster (age 20) was created 1st Earl of Leicester.

In 1267 [his brother-in-law] Edmund "Crouchback" Plantagenet 1st Earl of Leicester 1st Earl Lancaster (age 21) was created 1st Earl Lancaster.

On 08 Apr 1269 [his brother-in-law] Edmund "Crouchback" Plantagenet 1st Earl of Leicester 1st Earl Lancaster (age 24) and Aveline Forz 6th Countess Albemarle and Lancaster were married. She by marriage Countess Lancaster. She the daughter of William Forz 4th Earl Albemarle and Isabella Redvers 8th Countess Devon and Albemarle (age 31). He the son of [his father-in-law] King Henry III of England (age 61) and [his mother-in-law] Eleanor of Provence Queen Consort England (age 46). She a great x 5 granddaughter of King Henry I "Beauclerc" England.

On 20 Mar 1272 [his son] David Dunkeld was born to King Alexander III of Scotland (age 30) and [his wife] Margaret Queen of Scotland (age 31). He a grandson of King Henry III of England.

On 26 Feb 1275 [his wife] Margaret Queen of Scotland (age 34) died at Cupar Castle, Cupar. She was buried at Dunfermline Abbey [Map].

On 31 Aug 1281 [his son-in-law] Eric II King Norway (age 13) and [his daughter] Margaret Dunkeld Queen Consort Norway (age 20) were married at Bergen. She the daughter of King Alexander III of Scotland (age 39) and [his former wife] Margaret Queen of Scotland. He the son of King Magnus VI of Norway and Queen Ingeborg of Norway (age 37). She a granddaughter of King Henry III of England.

On 14 Nov 1282 [his son] Alexander Dunkeld Prince Scotland (age 18) and [his daughter-in-law] Margaret Dampierre Duchess Gueders (age 10) were married. She the daughter of Guy Dampierre Count Flanders (age 56) and Isabelle Luxemburg Countess Flanders (age 35). He the son of King Alexander III of Scotland (age 41) and [his former wife] Margaret Queen of Scotland. They were half third cousin once removed. He a grandson of King Henry III of England. She a great x 5 granddaughter of King William "Conqueror" I of England.

In 1285 [his mother] Marie Coucy (age 67) died.

On 15 Oct 1285 King Alexander III of Scotland (age 44) and Yolande Capet Duchess Brittany (age 24) were married. She the daughter of Robert Capet IV Count Dreux and Beatrice Montfort Countess Dreux (age 36). He the son of King Alexander II of Scotland and Marie Coucy. They were third cousin once removed. He a great x 3 grandson of King Henry I "Beauclerc" England. She a great x 5 granddaughter of King Henry I "Beauclerc" England.

On 19 Mar 1286 King Alexander III of Scotland (age 44) died at Kinghorn Ness. His granddaughter [his granddaughter] Margaret "Maid of Norway" I Queen Scotland (age 2) succeeded I Queen Scotland.

In or before 1295 Arthur Capet Duke Brittany (age 33) and [his former wife] Yolande Capet Duchess Brittany (age 33) were married. She by marriage Duchess Brittany 1221 Dreux. She the daughter of Robert Capet IV Count Dreux and [his former mother-in-law] Beatrice Montfort Countess Dreux (age 46). He the son of John Capet II Duke Brittany (age 55) and [his former sister-in-law] Beatrice Plantagenet. They were third cousins. He a grandson of King Henry III of England. She a great x 5 granddaughter of King Henry I "Beauclerc" England.

On 02 Aug 1330 [his former wife] Yolande Capet Duchess Brittany (age 69) died.