Classical
mouldings and projections which originated from the ancient Roman and
Greek classical design dominated the Georgian period.
A pediment is a
classical architectural element consisting of the triangular section
found above the horizontal structure (entablature), typically supported
by columns. Wikipedia
The Georgian architects
and builders often used this design as part of the main front door on
housing or on the gable end of large buildings.
Regency
1 Pilaster with
Greek key decoartion 2 Flat top supported with pilasters
1
2
3
4
Victorian
1& 2 Classical
door pediments inspired from the earlier Georgian period.