Major Mercer, the commander of the Worcestershire horse,[1] played a significant part in the Battle of Worcester in 1651,[2] but although mentioned in primary sources his full name is not given in them.
[3] David Laing speculated that he was John Mercer, the younger brother of William Mercer who was also a parliamentary officer and author of "Angliae Speculum, or England's looking-glass" (London 1646).
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