 In consequence, the eldest son could not inherit the title "Baron Macdonald" in the Peerage of Ireland.However, since the baronetcy ("Baronet of Sleat") was a Scottish title, it was later ruled in 1910, that the eldest son could succeed to that instead.The 3rd baron had married an illegitimate daughter of William Henry, Duke of Gloucester, in 1803; and the 3rd baron's eldest son, Alexander William Robert Macdonald, was born before that, in 1800.