The first creation came in 1789 in favour of Prince William, the third son of King George III.

The second creation came in the Peerage of the United Kingdom on 12 May 1831 for George Augustus Frederick FitzClarence, the eldest illegitimate son of William IV.

He was made Viscount FitzClarence and Baron Tewkesbury in the county of Gloucester at the same time.

The titles were created with remainder to his brothers Frederick, Adolphus and Augustus.

Lord Munster's great-grandson, the fifth earl (who succeeded his uncle), was a prominent Conservative politician and held ministerial office under five prime ministers.