Peerage Record – 23509

     Lady Isabella St. Lawrence was the daughter of Thomas St. Lawrence, 1st Earl of Howth and Isabella King.¹ She married Dudley Alexander Sydney Cosby, 1st and last Baron Sydney and Stradbally, son of Pole Cosby and Mary Dodwell, in December 1773.² She died on 28 October 1836.
     From December 1773, her married name became Cosby.¹

     Dudley Alexander Sydney Cosby, 1st and last Baron Sydney and Stradbally was the son of Pole Cosby and Mary Dodwell.² He married Lady Isabella St. Lawrence, daughter of Thomas St. Lawrence, 1st Earl of Howth and Isabella King, in December 1773.¹ He died on 17 January 1774.
     On 14 July 1768 Queen’s County in the Peerage of Ireland.¹ He was created 1st Baron Sydney, of Leix [Ireland] on 14 July 1768.¹ He was created 1st Baron Stradbally, Queen’s County [Ireland] on 14 July 1768.³ He held the office of Minister Plenipotentiary to the Court of Denmark.¹ In his death, his peerages became extinct, and the estates passed to his cousin, Admiral Phillips Cosby.¹

     Lady Elizabeth St. Lawrence was the daughter of Thomas St. Lawrence, 1st Earl of Howth and Isabella King.¹ She married Sir Paulus Aemilius Irving, 1st Bt., son of Paulus Æmilius Irving, in 1786.¹ She died in 1799.¹
     From 1786, her married name became Irving.¹

     Sir Paulus Aemilius Irving, 1st Bt. is the son of Paulus Æmilius Irving.² He married Lady Elizabeth St. Lawrence, daughter of Thomas St. Lawrence, 1st Earl of Howth and Isabella King, in 1786.¹
     He gained the title of 1st Baronet Irving.

     Lady Frances St. Lawrence was the daughter of Thomas St. Lawrence, 1st Earl of Howth and Isabella King.¹ She married Venerable Dr. James Phillott in 1808.¹ She died in 1842.¹
     From 1808, her married name became Phillott.¹

     Venerable Dr. James Phillott married Lady Frances St. Lawrence, daughter of Thomas St. Lawrence, 1st Earl of Howth and Isabella King, in 1808.¹

     Rosalía Seco Bahamonde married Cyril Charles Morrogh Bernard, son of John Morrogh Bernard and Frances Mary Blount, in 1884.¹
     From 1884, her married name became Morrogh Bernard.¹

     Major William B. Burke married Lady Matilda St. Lawrence, daughter of William St. Lawrence, 2nd Earl of Howth and Lady Mary Bermingham.¹
     He lived at Quansborough Lodge, County Galway, Ireland. He lived at Quansbury, County Galway, Ireland^G.¹

     Clifford Trotter married Lady Mary St. Lawrence, daughter of William St. Lawrence, 2nd Earl of Howth and Lady Mary Bermingham.¹

     William Ulick Tristram St. Lawrence, 4th Earl of Howth was born on 25 June 1827.¹ He was the son of Thomas St. Lawrence, 3rd Earl of Howth and Lady Emily de Burgh.¹ He died on 9 March 1909 at age 81 at Hotel Metropole, Bournemouth, Hampshire, England^G, unmarried.¹ He was buried on 15 March 1909 at Old Abbey of St. Mary^G.¹
     He was educated at Eton College, Windsor, Berkshire, England^G.¹ He gained the rank of Captain in 1847 in the 7th Hussars.¹ He held the office of High Sheriff of County Dublin in 1854.¹ He was State Steward to the Viceroy of Ireland between 1855 and 1858.¹ He was State Steward to the Viceroy of Ireland between 1859 and 1866.¹ He held the office of Member of Parliament (M.P.) (Liberal) for Galway Borough between 1868 and 1874.¹ He held the office of Vice-Admiral of the Province of Leinster.¹ He succeeded as the 4th Viscount St. Lawrence [I., 1767] on 4 February 1874.¹ He succeeded as the 18th Baron Howth [I., c. 1440] on 4 February 1874.¹ He succeeded as the 4th Earl of Howth [I., 1767] on 4 February 1874.¹ He was created 1st Baron Howth of Howth, co. Dublin [U.K.] on 7 October 1881.¹ He was appointed Knight, Order of St. Patrick (K.P.) in 1884.¹ On his death, all of his titles became extinct.¹