Convention of Royal Burghs

The Convention of Royal Burghs, more fully termed the Convention of the Royal Burghs of Scotland, was a representative assembly which protected the privileges and pursued the interests of Scotland's principal trading towns, the royal burghs, from the middle of the 15th century to the second half of the 20th century. The convention evolved as a forum in which burgh delegates, termed "commissioners", could "consult together and take common action in matters concerning their common welfare "before and during the sittings of parliament.

Source: Wikipedia — Convention of Royal Burghs (CC BY-SA 4.0)