He represented Askeaton in the Irish House of Commons for many years and voted against the Act of Union in 1800 at the age of over 90.
The fifth baronet sat as a Liberal member of parliament for Windsor and Chelsea.
The family seat was Stourhead in Wiltshire until 1946, and is now Luscombe Castle, Dawlish, Devon, England.
The Hoare baronetcy, of Sidestrand Hall in the County of Norfolk, was created in the Baronetage of the United Kingdom on 7 August 1899.
The heir apparent is the present holder's son Simon Merrick Hoare (born 1967).