Between 1791 and 1852, the Town Commissioners were the principal local authority.

In this year, women were admitted to the register to vote in and stand for election to principal local authorities.

However, it is also relevant to those considering delegation in two-tier areas, including principal authorities.

Baptist churches do not have a central principal authority.

Eichhorn was regarded as one of the principal authorities on German constitutional law.

The Senate is the principal academic authority of the University.

The principal local authority in the area is Cornwall Council.

Like other central banks, it is the principal monetary authority of the country.

A Science editor described him as "the principal scientific authority of the Fundamentalists".

A lifetime's devotion to ants has made him the principal authority on the subject.