Summary: | The Edinburgh Royal College of Physicians manuscript of <i>Cursor Mundi</i> and the <i>Northern Homilies</i>, a northern Middle English text from the early 14th century, contains unprecedentedly high frequencies of matrix verb-third and embedded verb-second word orders with subject–verb inversion. I give a theoretical account of these word orders in terms of a grammar, the ‘CM grammar’, which differs minimally in its formal description from regular verb-second grammars, but captures these unusual word orders through addition of a second preverbal A<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>′</mo></msup></semantics></math></inline-formula>-projection. Despite its flexibility, the CM grammar did not spread through the English-speaking population. I discuss the theoretical consequences of this failure to spread for models of grammar competition where fitness is tied to parsing success, and discuss prospects for refining such models.
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