"Constance I (2 November 1154 – 27 November 1198) was Queen regnant of Sicily in 1194–98, jointly with her spouse from 1194 to 1197, and with ...
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her infant son Frederick II, Holy Roman Emperor, in 1198, as the heiress of the Norman kings of Sicily. She was also Holy Roman Empress by marriage to Henry VI, Holy Roman Emperor." - (en.wikipedia.org 28.10.2019)
