Treasury Bill

Rufus of England, popularly nicknamed Treasury Bill, was a cat who served as Chief Mouser to the Cabinet Office of the United Kingdom under prime minister Ramsay MacDonald.

[1][2] Treasury Bill was described as a ginger cat and a "a renowned ratcatcher".

[3] His nickname was created among Cabinet members and house staff.

[4] Whilst technically the first cat to serve in this role, he was never officially given the title and only served for less than a year, meaning his successor − Peter − is often considered the first chief mouser.

[5] Treasury Bill served during MacDonald's first term as prime minister in 1924 and returned in 1929 when MacDonald became prime minister for the second time.