The term HRE PART is an acronym for the HOLY ROMAN EMPIRE, which was a complex political entity that existed from 962 to 1806. It was composed of several German states and was ruled by an emperor elected by the prince-electors. The ROMAN part of the name refers to the fact that the EMPIRE was modeled after the ROMAN EMPIRE, while the HOLY part of the name refers to the fact that it was a Christian EMPIRE. The EMPIRE part of the acronym stands for the various German states that made up the EMPIRE, while the EMP part stands for the emperor who was elected by the prince-electors.