One hypothesis is that the "Brown Bess" was named after Elizabeth I of England, but this lacks support. Jonathan Ferguson, Firearms Curator of the Royal Armouries, traces the name to at least the 1760s, and his research suggests the name was adopted from slang for a mistress, prostitute, or lowly woman who also appear in period sources referred to as "Brown Bess." He writes, "'Bess' was a generic and sometimes derogatory name, a bit like 'Sheila' in modern Australian English", and "brown" simply meant plain or drab. Ferguson discounts, with evidence, many of the other theories previously popular.