He was an influential proponent of establishing a League of Nations after the First World War.
[2] He married Elizabeth, daughter of General Sir Richard John Meade,[3] in 1891.
On 18 January 1930 he was raised to the peerage as Baron Dickinson, of Painswick in the County of Gloucester.
[4] Lord Dickinson died in May 1943, aged 84, and was succeeded in the barony by his grandson Richard, his only son the Hon.
Willoughby Dickinson's sister, Frances May, an anaesthetist, was the first wife of surgeon Sir James Berry.