The English florin, sometimes known as the double leopard, was an attempt in 1344 by Edward III to produce gold coinage suitable for use in Europe as well as in England. It was authorised on 27 January 1344, and struck from 108 grains (6.99829 grams) of nominal pure ('fine') gold and had a value of six shillings (equivalent to 30 modern pence).[1][2][3]
The continental florin, based on a French coin and ultimately on coins issued in Florence in 1252, was a standard coin (3.50 g fine gold) widely used internationally. The newly-introduced English florin at twice this nominal weight was ultimately found to be wrongly tariffed, resulting in it being unacceptable to merchants. It was almost immediately withdrawn from circulation and in August 1344, after only a few months, it was replaced by the more successful gold noble (7.80g gold, valued at 6s 8d).