The Pantheon is a mythical creature. It appears to have been invented by the herald

Herald

A herald, or, more correctly, a herald of arms, is an officer of arms, ranking between pursuivant and king of arms. The title is often applied erroneously to all officers of arms....

s of the Tudor period

Tudor period

The Tudor period usually refers to the period between 1485 and 1603, specifically in relation to the history of England. This coincides with the rule of the Tudor dynasty in England whose first monarch was Henry VII...

. During that period it was used in a number of grants of arms.

The Pantheon was a star-spangled hind (a female red deer

Red Deer

The red deer is one of the largest deer species. Depending on taxonomy, the red deer inhabits most of Europe, the Caucasus Mountains region, Asia Minor, parts of western Asia, and central Asia. It also inhabits the Atlas Mountains region between Morocco and Tunisia in northwestern Africa, being...

), usually black or dark blue in colour, although sometimes red.

Pantheons appear in the arms of the United Kingdom Atomic Energy Authority

United Kingdom Atomic Energy Authority

The United Kingdom Atomic Energy Authority is a UK government research organisation responsible for the development of nuclear fusion power. It is an executive non-departmental public body of the Department for Business, Innovation and Skills and was formerly chaired by Lady Barbara Judge CBE...

. The arms were granted in 1955.