Answer: hre

AnswerCrossword Clue
HREDominion until 1806 (abbr.)
HRERealm until 1806: Abbr.
HREAny of four Ottos: Abbr.
HREOtto I was its first leader: Abbr.
HRERealm from 800-1806: Abbr.
HRE1,000-yr. realm
HRECentral Eur. power until 1806
HRECenturies-long realm dissolved in 1806: Abbr.
HRECharles V's domain: Abbr.
HRECharlemagne's reign (abbr.)
HRECharlemagne's dom.
HREIt dissolved when Francis II abdicated: Abbr.
HREMaximilian I's dom.
HREHistoric realm of Europe (abbr.)
HREFrederick Barbarossa's realm (abbr.)
HRERealm of Maximilian I (abbr.)
HREBarbarossa's realm (abbr.)
HRECharlemagne's domain (abbr.)
HREBarbarossa's bailiwick (abbr.)
HREDomain where Charlemagne reigned, briefly
HREFrancis II dissolved it in 1806: Abbr.
HRELouis I's realm: Abbr.
HREBygone Eur. realm
HREOtto's realm: Abbr.
HRECharlemagne's realm (abbr.)
HREOtto I's realm (abbr.)
HREOtto's realm (abbr.)
HREDomain of Otto I (abbr.)
HREOtto's realm(abbr.)
HREOtto's domain (abbr.)
HRECharlemagne's domain: Abbr.
HRECharlemagne's letters
HREDominion until 1806: Abbr.
HREBaseball scoreboard letters
HRECharlemagne's reign: Abbr.
HREOtto I's realm: Abbr.
HRERealm from 800-1806 A.D.
HRE75-Across's domain: Abbr.
HRECharlemagne's realm: Abbr.
HRE1,000-plus-year realm: Abbr.