Daniel IV's last descendant in the male line was General Richard II O'Donovan, who was the first person in two hundred years to declare himself "the O'Donovan", based on his lineage and social stature. Following his death in 1829, the title 'the O'Donovan' was assumed by Protestant clergyman Morgan O'Donovan but his claim was not accepted by the clan. General O'Donovan willed the last of the ancient Clancahill estates, Bawnlahan, to the family of his wife, by whom he had no issue. General O'Donovan's self-proclaimed chiefship was passed by his agreement to a cadet line in the person of the Reverend Morgan O'Donovan of Montpelier, who was a descendant of Teige O'Donovan, of Mauleycorane, son of Donal II by the Lady Joanna née MacCarthy Reagh. The title of O'Donovan of Clan Cahill has been passed to subsequent generations from Rev. O'Donovan.