Inverkeithing in Fife was a royal burgh that returned one commissioner to the Parliament of Scotland and to the Convention of Estates.
After the Acts of Union 1707, Inverkeithing, Culross, Dunfermline, Queensferry and Stirling formed the Stirling district of burghs, returning one member between them to the House of Commons of Great Britain.
References
Inverkeithing (Parliament of Scotland constituency) Wikipedia(Text) CC BY-SA