The subsidiary titles held by the Viscount are: Baron Wimborne (created 1880) and Baron Ashby of St Ledgers (1910). Furthermore, the Viscount holds a Baronetcy.
Sir Ivor Bertie Guest, 1st BaronWimborne (29 August 1835)- (22 February 1914), in Dowlais, Wales was the son of Lady Charlotte Guest, translator of the Mabinogion, and John Josiah Guest, owner of the world's largest iron foundry.
The 1st Baron was an uncle-by-marriage of Sir Winston Churchill.
The 1st BaronWimborne is the ancestor of the Viscounts Wimborne.