Hyde 1933, p. 9. "Alexander Stewart, Castlereagh's paternal grandfather, was born at Ballylawn in 1700." Hyde, H. Montgomery (1933). The Rise of Castlereagh. London: MacMillan. OCLC1041306416.
Johnston 1906, p. 80. "Alexander Stewart of Ballylawn and Mount Stewart, great-great-grandson of John Stewart of Ballylawn castle said to be a cadet of Garlies ..." Johnston, G. Harvey (1906). The Heraldry of the Stewarts. Edinburgh: W. & A. K. Johnston. OCLC186630114.
Hyde 1933, p. 7. "... built a castle on the estate, which he called Stewart's Court and exercised the manorial rights of free fishing in Lough Swilly ..." Hyde, H. Montgomery (1933). The Rise of Castlereagh. London: MacMillan. OCLC1041306416.
Debrett 1828, p. 634, line 26. "Thomas, the eldest, succeeded at Ballylawn Castle and served as captain in Mountjoy's regiment; m. [married] Mary 2nd da. [daughter] of Bernard Ward, esq., (ancestor of the viscounts Bangor) by Mary sister of Michael Ward, bishop of Derry, and d. without issue, 1740, was succeeded by his only brother ..." Debrett, John (1828). Peerage of the United Kingdom of Great Britain and Ireland. Vol. II (17th ed.). London: F. C. and J. Rivington. OCLC54499602. – Scotland and Ireland
Benson 2004, p. 336. "He left his property to Alexander Stewart of Newtownards, County Down, the father of the first marquess of Londonderry, for distribution to his relatives."
Bew 2012, p. 6, penultimate line. "In fact his [i.e. Castlereagh's] Irish ancestors could be firmly traced back a further three generations to the Plantation of Ireland in the mid-sixteenth century, during which time Alexander's grandfather (known as Alexander Macaulay) obtained a plot of land at Ballylawn, near the town of Moville in County Donegal, in the north-west of Ireland." Bew, John (2012). Castlereagh: A Life. London: Oxford University Press. ISBN978-0-19-993159-0. – (Snippet view)
Watt. "Her trustees invested, in 1744, a portion of her fortune thought to be in the region of £42000, consisting of East India Company Stock, in 'two extensive manors in County Down, Newtownards and Comber, comprising in all sixty townships, which were for sale and might be expected to yield a satisfactory return on capital investment'." Watt, Dr Neil. "Mary Cowan".
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Johnston 1906, p. 80. "Alexander Stewart of Ballylawn and Mount Stewart, great-great-grandson of John Stewart of Ballylawn castle said to be a cadet of Garlies ..." Johnston, G. Harvey (1906). The Heraldry of the Stewarts. Edinburgh: W. & A. K. Johnston. OCLC186630114.
Hyde 1933, p. 9. "Alexander Stewart, Castlereagh's paternal grandfather, was born at Ballylawn in 1700." Hyde, H. Montgomery (1933). The Rise of Castlereagh. London: MacMillan. OCLC1041306416.
Johnston 1906, p. 80. "Alexander Stewart of Ballylawn and Mount Stewart, great-great-grandson of John Stewart of Ballylawn castle said to be a cadet of Garlies ..." Johnston, G. Harvey (1906). The Heraldry of the Stewarts. Edinburgh: W. & A. K. Johnston. OCLC186630114.
Hyde 1933, p. 7. "... built a castle on the estate, which he called Stewart's Court and exercised the manorial rights of free fishing in Lough Swilly ..." Hyde, H. Montgomery (1933). The Rise of Castlereagh. London: MacMillan. OCLC1041306416.
Debrett 1828, p. 634, line 26. "Thomas, the eldest, succeeded at Ballylawn Castle and served as captain in Mountjoy's regiment; m. [married] Mary 2nd da. [daughter] of Bernard Ward, esq., (ancestor of the viscounts Bangor) by Mary sister of Michael Ward, bishop of Derry, and d. without issue, 1740, was succeeded by his only brother ..." Debrett, John (1828). Peerage of the United Kingdom of Great Britain and Ireland. Vol. II (17th ed.). London: F. C. and J. Rivington. OCLC54499602. – Scotland and Ireland