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|Countess of Atholl|
|Died||25 December 1266|
|Spouse(s)||John de Strathbogie|
|Issue||David Strathbogie, Earl of Atholl|
|Father||David de Hastings|
|Mother||Forbhlaith, Countess of Atholl|
Ada, Countess of Atholl (c. 1221–25 December 1266), was the daughter and heir of Forbhlaith, Countess of Atholl and her husband, David de Hastings. Ada's mother, Forbhlaith, was herself heir of the highland mormaerdom of Atholl, Scotland.  Ada was Countess of Atholl suo jure, she held the title in her own right, and not through her husband. She inherited the title from her mother, who was also suo jure Countess of Atholl. Upon her death the title went to her son, David of Strathbogie. David was the first of the Earls of Atholl to be named Strathbogie. David's father John was able to use the title of Earl but held it only by right of his wife, Ada, he was jure uxoris Earl of Atholl, as Ada's father had been.
Ada's husband, John de Strathbogie, was the son of David of Strathbogie and grandson of Duncan II, Earl of Fife. Together they were the progenitors of the Strathbogie dynasty of Atholl Earls, beginning with their son David of Strathbogie, 8th Earl of Atholl. 
She died some time before 25 December 1266.
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The Mormaer or Earl of Buchan was originally the provincial ruler of the medieval province of Buchan. Buchan was the first Mormaerdom in the High Medieval Kingdom of the Scots to pass into the hands of a non-Scottish family in the male line. The earldom had three lines in its history, not counting passings from female heirs to sons. Today, it is held by the Erskine family as a peerage. The current holder is Harry Erskine, 18th Earl of Buchan.
Baron Strabolgi is a title in the Peerage of England supposedly created in 1318 for Scottish lord David of Strathbogie, 10th Earl of Atholl. Despite lack of evidence supporting its existence, it was called out of abeyance by the House of Lords in 1916. Whether it ever existed before then is open to serious dispute.
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The Mormaer or Earl of Atholl was the title of the holder of a medieval comital lordship straddling the highland province of Atholl, now in northern Perthshire. Atholl is a special Mormaerdom, because a King of Atholl is reported from the Pictish period. The only other two Pictish kingdoms to be known from contemporary sources are Fortriu and Circinn. Indeed, the early 13th century document known to modern scholars as the de Situ Albanie repeats the claim that Atholl was an ancient Pictish kingdom. In the 11th century, the famous Crínán of Dunkeld may have performed the role of Mormaer.
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David Strathbogie was the first Strathbogie Earl of Atholl.
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John Campbell, Earl of Atholl was a Scottish nobleman.
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Hawise of Chester, 1st Countess of Lincoln suo jure, was an Anglo-Norman noblewoman and a wealthy heiress. Her father was Hugh de Kevelioc, 5th Earl of Chester. She was the sister and a co-heiress of Ranulf de Blondeville, 6th Earl of Chester. She was created suo jure 1st Countess of Lincoln in 1232. She was the wife of Robert de Quincy, by whom she had one daughter, Margaret, who became heiress to her title and estates. She was also known as Hawise of Kevelioc.
Anastasia de Montfort, Countess of Nola, was an Italian noblewoman and a wealthy heiress. She was the eldest daughter of Guy de Montfort, Count of Nola, himself the son of Simon de Montfort, 6th Earl of Leicester. She held the title suo jure Countess of Nola after her father's death in 1291. She also held the titles of suo jureDame de Chailly and suo jureDame de Longjumeau. She was the wife of Romano Orsini, Senator of Rome.
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