The Holy Roman Empire was a multi-ethnic complex of territories in Western and Central Europe that existed from the 9th to the 19th centuries. Otho (4 letters) was a German king who reigned briefly in the year 936. Lothair (7 letters) was a Frankish king who ruled the Holy Roman Empire from 817 to 855. Matthias (8 letters) was an Austrian archduke who was elected Holy Roman Emperor in 1612. OTTO (4 letters) was a German king who was crowned Holy Roman Emperor in 962. Othoi (5 letters) was a Byzantine emperor who reigned from 1057 to 1059. OTTO I (5 letters) was a German king who was crowned Holy Roman Emperor in 962. OTTO IV (6 letters) was a German king who was elected Holy Roman Emperor in 1209.