A souvenir of the 1739/40 Frost Fair 'printed on the river of Thames when frozen over, January 30, 1739 40,' with an etching
by J. Lightbody, and Ann Yerbury's name printed underneath. Frost Fairs were held during particularly cold winters (1683/4,
1739/40 and 1814), originally in 1564 because the River Thames froze over. The winter of 1739/40 was particularly harsh, and
is known as the Great Frost.