Wikipedia
Cromartyshire is a historic county in the Highlands of Scotland, comprising the medieval "old shire" around the county town of Cromarty and 22 exclaves transferred from Ross-shire in the late 17th century. The largest part, six times the size of the old shire, is Coigach, northwest from Ullapool. In 1890, Cromartyshire was merged with Ross-shire into the administrative county of Ross and Cromarty. In 1975, the resulting county was combined with Caithness, Inverness-shire, Nairnshire, Sutherland, and parts of Argyllshire and Morayshire to form the Highland council area.
Cromartyshire was a county constituency of the House of Commons of Great Britain from 1708 until 1800, and of the House of Commons of the United Kingdom from 1801 to 1832.
Before the Act of Union 1707, the barons of the shire of Cromarty elected commissioners to represent them in the unicameral Parliament of Scotland and in the Convention of Estates. After 1708, Cromartyshire and Nairnshire alternated in returning one member the House of Commons of Great Britain and later to the House of Commons of the United Kingdom.