In the 1870s Alexander Reuben Mangin of Pall Mall, London, owned 731 acres in county Tipperary. The registers of St George's Church of Ireland, Dublin, record the marriage of Rubin Mangin of French Street and Magdalin Dabzac in 1803 and the birth of Reuben Alexander Mangin in 1818.
National Library of Ireland:
Papers of Lady Pamela Campbell (1796-
1869), “Anecdotes of Wm. Ogilvie and the Duchess of Leinster. By the late Alexander Mangin Esqr;”. Collection List 88, MS 40,025 /1