The Earls of Castle Stewart claim to be the head representatives in the pure male line of the Scottish Royal House of Stuart. They are directly descended from Sir Walter Stewart (died 1425) Keeper of Dumbarton Castle, younger son of Murdoch Stewart, 2nd Duke of Albany, son of Robert Stewart, 1st Duke of Albany, younger son of King Robert II of Scotland. One of Sir Walter's sons, Andrew Stuart, was created Lord Avandale (or Avondale) in 1459 and became Lord Chancellor of Scotland from 1460 to 1482. Another son, Walter Stewart, became feudal Baron of Morphie and was legitimized in 1479. His grandson Andrew Stewart was created Lord Avondale circa 1499, a revival of the title which had become extinct on his great-uncle's death in 1488. Andrew, Lord Avondale, was one of the many Scottish peers who were killed at the Battle of Flodden in 1513.
The eldest son of Lord Avondale (killed 1513), Andrew Stewart, 2nd Lord Avondale, exchanged the Lordship of Avondale with Sir James Hamilton for that of Ochiltree (see the Lord Ochiltree for further history of this title) by an Act of Parliament in 1542, becoming Lord Stuart of Ochiltree. He was succeeded by his son, Andrew Stewart, 2nd Lord Ochiltree. His son, Andrew Stuart, 1st Baron Castle Stuart succeeded him as 3rd Lord Ochiltree and became First Gentleman of the Bedchamber to King James VI. To raise money, in 1615 he resigned the feudal barony of Ochiltree and the peerage to his first cousin, Sir James Stuart, the son of James Stewart, Earl of Arran, younger son of the second Lord Ochiltree.
In compensation for the loss of this title, in 1619 the King created the previous 3rd Lord Ochiltree the Baron Castle Stuart in the Peerage of Ireland. In 1611, he had settled in Ulster where he was granted 3,000 acres (12 km²) of land in County Tyrone. He was succeeded by his son, the second Baron, Andrew Stewart (1590-1639), who one year before the death of his father had in 1628 been created a Baronet in the Baronetage of Nova Scotia. The second Baron made his home at Roughan Castle and was the founder of nearby Stewartstown, County Tyrone. His eldest son, Sir Andrew Stewart 2nd Bt., became the third Baron and Governor of Fort Falkland in County Offaly fighting as a Royalist in the Civil War. He was the father of one daughter, Mary, his sole heiress. She married Henry Howard, 5th Earl of Suffolk, and the majority of the Stewart estates in Ireland were swallowed up by him. The title Baron Castle Stewart passed briefly to Sir Andrew's brother, Josias Stewart, who died childless. On the death of the fourth Baron, his uncle the Hon. John Stewart (d.1685) succeeded to the title as the 5th Baron. After John's death, the title was passed to his nephew, Robert Stewart (1646-1686) of Irry in County Tyrone, the eldest son of Robert Stewart, of Irry, third son of Andrew Stuart, 1st Baron Castle Stuart. The 6th Baron Castle Stewart was the father of Andrew Stewart (1672-1715), who during the wars of the Revolution was taken to Scotland. At the age of twelve, he became the rightful heir to the title 7th Baron Castle Stewart, but on returning to Ireland in adulthood he did not think it fit to claim the title as the land that had once gone with it was no longer his, having been given as a dowry to the previously mentioned Earl of Suffolk. Instead, the de jure 7th Baron made his home at Irry, which he renamed Stuart Hall, near Stewartstown, County Tyrone. His son, Robert Stewart (1700-1742) of Stuart Hall, for the same reasons as his father, chose not to become the 8th Baron Castle Stewart. After remaining dormant for 88 years the title Baron Castle Stewart was reclaimed by Andrew Thomas Stewart (1725-1809) of Stuart Hall, the eldest son of the de jure 8th Baron. He successfully petitioned the King and in 1774 became the rightful 9th Baron Castle Stewart. In 1793, he was created 1st Viscount Castle Stuart and in 1800 he was further honoured by being created the 1st Earl Castle Stewart all in the Peerage of Ireland.
Lord Castle Stewart was baptised Andrew Thomas Stewart-Moore. Moore was the maiden name of his paternal great-grandmother, Anne (Moore) Stewart, daughter of William Moore of Garvey, a first cousin the 1st Earl of Clanbrassil. He only assumed the surname of Stewart by Royal License in 1775. He was succeeded by his eldest son, the second Earl. His eldest son, the third Earl, died childless and was succeeded by his younger brother, the fourth Earl. His only son, the fifth Earl, assumed in 1867 by Royal licence the additional surname of Richardson (which was that of his father-in-law. He died without male issue and was succeeded by his first cousin, who became the sixth Earl. He was the second but eldest surviving son of Reverend the Hon. Andrew Godfrey Stuart, fourth son of the second Earl. His two elder sons were both killed in the First World War and he was therefore succeeded by his third son, the seventh Earl, in 1921. He represented Harborough in the House of Commons as a Unionist. He married Eleanor May Guggenheim (eldest daughter of Irene Guggenheim (née Rothschild) and Solomon R Guggenheim) in December 1920. They had four sons. His two elder sons were both killed in the Second World War. As of 2014 the titles are held by his third son, the eighth Earl, who succeeded in 1961.
Another member of the Stuart/Stewart family was Henry Stewart, 1st Lord Methven. He was a younger son of the first Lord Avondale (of the second creation). The Earldom and Baronetcy of castle Stewart are registered with the Crown Office (now Ministry of Justice), and recorded at the College of Arms, London.
The heir apparent is the present holder's son only son Andrew Richard Charles Stuart, Viscount Stuart (b. 1953).
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