Penny - Wikipedia
Halfpenny (British decimal coin) - Wikipedia
In Britain 100 years ago, what was the smallest amount of currency you could have, and how many of them were in £1? - Quora
How much was a pound worth in medieval times? - Quora
Indian Head cent - Wikipedia
Penny (Irish pre-decimal coin) - Wikipedia
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How much did a loaf of bread cost in medieval times? - Quora
What can we infer about the value of money in medieval England based on a labourer's daily earnings? - Quora