The action evolved from the writ of "indebitatus assumpsit". This count is considered a type of assumpsit. This form of pleading gave rise to the name of the action&colon; "indebitatus assumpsit". It was heard under "assumpsit", and the jury found that Morley indeed owed Slade money. Just as forms of assumpsit replaced debt, so in the seventeenth century trover replaced detinue.