There's a branch for "Does the HRE exist" (in the top left corner), which basically says that "territorial maps" aren't well defined before the mid-modern period.
OK! Though we also had lots of Germanies in the 19th century between dissolution of HRE and before Bismarck forced the partition into (more or less) two Germanies (Kleindeutschland in the north and Austria-Hungary in the south).