Frederick I was nicknamed "Red Beard" or "Barbarossa". Frederick was born in 1 122. His parents were Frederick II, Duke of Schwaben of Hohenstaufen dynasty, and Judith of the Bavarian Welf family.

1 147 inherited the title of Duke of Swaben and was called Frederick III. 1 152, he won the election of the German king and was crowned king of the Roman people in the Hohenstaufen dynasty.

1 155, at the request of Pope Pope Eugene III, Frederick sent troops to Italy and accepted the iron crown in pavia, where he was crowned king of Italy. 1 155, in St. Peter's Cathedral in Rome, Pope Adrian IV canonized Frederick as the Holy Roman Emperor, and the world called him Frederick I.. 1 178, Frederick was crowned again in arles and became the king of Burgundy.

However, on a hot summer evening in June 1 190, the 68-year-old emperor was riding a horse across the Salfa River when he suddenly had a heart attack and fell into the river and drowned.

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Although Frederick I and his empire are famous, his centralized policy is still strongly challenged in Germany, which has formed a vassal regime. His main enemy and competitor is Henry, the lion of Herzogtum Von Sachsen, who also won Bavaria at 1 156.

1 174, because Henry the lion refused to take part in the military action against Italy, Frederick I attacked Henry and defeated him. Most of Henry's land was deprived, and only Brunswick and Luneburg were saved.

But Frederick I did not divide the territory confiscated by Henry the lion into royal territory, but gave it to other dukes. Since then, the confiscated principality can only be owned by the emperor for a short time, which has become a German practice.