Flags of the Holy Empire

The first flag of the empire is this flag:

The second flag of the empire is this flag:

We have two others flag which are the third and fourth but we don’t have them and are considered lost media but there is a description: take the Imperial German Empire flag (tricolor of black on top, white in the middle, and red on the bottom) and in the top left corner is a yellow square with an early version of the coat of arms, the two flags differences are the coat of arms design and complexity.

Finally, the current flag is this: