From Evanson (Durrus) family history:

The first Mrs Evanson had sisters, one married the O’Shaughnessy (whose daughter married the O’Donovan, ancestor of the late General O’Donovan); and another married Mr Butler (the family of the Duke of Ormond); and another married Mr J Warren.

1829.  Death of The O’Donovan, General O’Donovan in his 61st Year, Bawnlahan, Skibbereen, West Cork. and Passing of Chieftainship of Clann Cathal to Montpelier (Douglas, Cork) Branch.

He married a Miss Powell from Wales and on his death the estates passed out of the family ending up ultimately with her nephew.

Lieutenant-Colonel Henry Claringbould Powell, (1801-1902), 1874, Bawnlahan (O’Donovan Estate), Leap, Resident, £67, 2nd. son Major Edward Powell and Eleanor d James B. Buchanan, m Mary Ann d Lieutenant-General Hutchesson, oldest son Rev. Francis Perry Hutchesson b 1843, Newcastle. Estate to Powells from Lieutenant-General O’Donovan (The O’Donovan) on death of his widow to her brother Major Powell.  Probate last address 2, Alfred Place, Dover, in Ireland £1,886. Land record, 1870, 2,475 acres.

Doctor John O’Donovan queries into family:

https://docs.google.com/document/d/1GCiBrLiBZtDkU8Ug5hZn9HnIZgfN1dvK2kkfaDUb600/edit

https://durrushistory.com/2015/07/23/lt-col-richard-odonovan-of-bawnlahan-skibbereen-west-cork-son-of-daniel-odonovan-the-odonovan-of-clancahill-and-jane-beecher-1768-major-in-6th-dragoons-19-december-1799-lieuten/

https://durrushistory.com/2015/04/25/survey-15th-march-1727-of-odonovan-estates-bawnlahan-including-townlands-of-coolagow-bawnlahan-and-cuppogh-west-cork/

https://durrushistory.com/2014/12/30/the-caoin-lamentation-akin-to-hebrew-cina-in-cork-and-kerry-from-crofton-croker-including-for-sir-richard-cox-in-1733-mentioning-his-relations-odonovans-of-bawnlahan-townsends-of-white-court-sk/

O’Donovan Estates:

https://durrushistory.com/2015/11/23/some-odonovan-bawnlahan-west-cork-deeds-conveyances-settlements-leases-mortgages-including-to-samuel-jervois-brade-from-1619/

https://durrushistory.com/2015/09/23/odonovan-estates-including-bawnlahan-west-cork-1737-2/

https://durrushistory.com/2015/08/29/death-of-general-odonovan-bawnlahan-skibbereen-west-cork-1829-the-late-much-regretted-general-odonovan-was-one-of-the-very-few-proprietors-of-this-county-of-the-aborigi/

On the General’s death the Chieftainship passed to the ‘Montpelier’ branch i.e. that of Morgan O’Donovan of Douglas Cork.  His descendant are here.  Interestingly they appear to be scholars subscribing to historical journal interested in antiquities, archaeology genealogy, briseann an duchais as súil an chait!

Henry Wintrop ‘The O’Donovan’ (1812-1896),  TCD, MA, DL. Pre 1910, Clann Cathal, Lis Ard, Skibbereen, son Rev. Morgan, Corl ed Dr. Coughlan, m Amelia d ‘The O’Grady’, Courcy O’Grady, Kilbollyowne, Co.Limerick.  Son Colonel Morgan William MA, JP, ‘The O’Donovan’ and Alicia Jones.

Colonel Morgan William O’Donovan or ‘The O’Donovan’ -1870), MA, ‘The O’Donovan’, Mountpelier, Douglas, Cork,  m  Alicia Jones, 1863 patron Masonic concert Skibbereen, subscriber 1861 to Smith’s History of Cork. 1835 received benefit from Morgan O’Donovan of rent charge at lands at Carrigfadda and Lisardreeher entitling him to vote.   Member Irish Society Antiquaries 1861.  Probate to son Henry Winthrop O’Donovan, Lissard, Skibbereen, £35,000. Land record, 1870, 3,620 acres.

Rev. Morgan O’Donovan (1740-1802), Ballinacalla, West Carbery, m. Melian Towgood French c 1776, Daughter Mary m John Townsend Beecher with £5,000, died Blackrock.

Colonel Morgan William ‘The O’Donovan’ Oxon (1861-1940), CB, D.L., MA, 1888, ‘The O’Donovan’, Clann Cathal, Lis Ard, Skibbereen, son of Henry Wintrop ‘The O’Donovan’ MA, DL. and  Amelia d ‘The O’Grady’, Courcy O’Grady, Kilbollyowne, Co. Limerick. Ed. Haileybury and Oxford, Lieutenant-Colonel Munster Fusiliers, Colonel South Cork Militia Boer War, Succeeded Colonel Aylmer C. Somerville 1899 as President Carbery Agricultural Society.  M Mary Eleanor, (Madame) odo Rev. J Yarker Barton, Chaplain to British Forces, she chaired the Women’s Emergency Recruiting Committee WW1, Skibbereen, listed 1921.