The Farthing was a small circulating coin of the British pre-decimal Pound Sterling, equal to a quarter of a penny. Prices were never written in farthings though - something worth a farthing would be quoted as 1/4d ("d" being the abbreviation for "penny", from the Roman "denarius"). There were 20 shillings to a pound, 12 pence to a shilling and 4 farthings to a penny, so 960 of these coins made up £1.
In 1801 the parliaments of Great Britain and the Kingdom of Ireland each passed an Act of Union, uniting the two kingdoms and creating the United Kingdom of Great Britain and Ireland. Re-coinage followed in 1806, after which four types of farthings were issued: a large copper coin with concave surfaces and a Britannia reverse (1806 and 1807 only), a large copper coin with a second Britannia design (1821 to 1864), then smaller bronze coins - with a third Britannia design (1860 to 1895), a simplified fourth Britannia design (1895 to 1936) and finally a new farthing design featuring a wren bird (1937 to 1956).
Listed below are farthing types that were considered but never approved for production and released into circulation.
The farthing denomination was demonetised before the rest of the pre-decimal currency - it ceased to be legal tender after 31 December 1960. | 
