In later life, he served as private secretary to Prince Albert and later Queen Victoria.

After a good private education he joined the British Army as a sub-lieutenant in 1820 and commanded the 73rd Regiment of Foot from 1833 to 1842.

Grey represented Wycombe in the British House of Commons from 1832 to 1837, defeating Disraeli to win the seat, which he held until 1837.

In 1836, he had married Caroline Eliza, daughter of Sir Thomas Harvie Farquhar, 2nd baronet.

He plays a key role in 'Black Butler: Book of Murder' and has been a popular character throughout the series.