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When did Joseph II rule as Holy Roman emperor?

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Portrait painting of Joseph II, Holy Roman Emperor, wearing a black and red military coat with medals and a sash, with St. Peter's Basilica visible in the background. — Joseph II Joseph II, Holy Roman emperor, detail of a painting by Pompeo Girolamo Batoni, 1769; in the Kunsthistorisches Museum, Vienna.

Joseph II served as Holy Roman emperor from 1765 to 1790.12

His reign is divided into two distinct periods:
* 1765–1780: He served as emperor and co-regent with his mother, Maria Theresa, who retained the majority of political authority during this time.23
* 1780–1790: Following his mother's death, he ruled as the sole ruler of the Austrian Habsburg dominions.23