Frederick I of Sweden
Frederick of Hesse-Kassel became king of Sweden in 1720 after his wife Ulrika Eleonora abdicated. He reigned during the Age of Liberty, when Parliament sharply limited royal power; from 1730 he was also landgrave of Hesse-Kassel.
This complete profile is available in English. Bibliographic titles retain their original language. Links marked ES open the Spanish edition.
Key details
Birth: 28 April 1676 Documented
Death: 5 April 1751 Documented
Role: King
Dynasty: Hesse-Kassel · ES
Territories: Sweden (ES) · Hesse (ES) · Hesse-Kassel (ES)
Recorded relationships
Their titles over time
Follow the changing territories and offices of Frederick I of Sweden. Each title retains its own status.
Governments in 1730
- SwedenKing
View titles and jurisdictions
- Sweden · ESKing · Effective rule1720–1751
- Hesse-KasselLandgrave
View titles and jurisdictions
- Hesse-Kassel · ESLandgrave · Effective rule1730–1751 · He succeeded his father Charles in 1730. King of Sweden since 1720, he entrusted the landgraviate to his brother William as lieutenant and regent.
Annual dates: overlap within one year does not prove that two offices were held on the same day. Regencies and co-rulerships retain their labels.
Sources for this profile
- Neue Deutsche Biographie · Friedrich I., Landgraf von Hessen-Kassel, König von Schweden
- Allgemeine Deutsche Biographie · Wilhelm VIII., Landgraf von Hessen-Kassel
- Deutsche Nationalbibliothek · GND authority record · Friedrich I., Schweden, König
- Encyclopaedia Britannica
Biographical and contextual references in their original language. Sources and methodology.
Evidence for this profile
6 recorded claims · 1 without a claim-specific source. Context references do not by themselves verify every fact.
Dates (2/2 with a precise source)
- BirthDocumented
28 April 1676
The authority record gives the birth as 1676-04-28. - DeathDocumented
5 April 1751
The authority record gives the death as 1751-04-05.
Family and relationships (2/2 with a precise source)
- FatherDocumented
Charles I of Hesse-Kassel
The authority record identifies Charles I of Hesse-Kassel (GND 118560050) as father. - Marriage or partnershipDocumented
Ulrika Eleonora of Sweden
The authority record identifies Ulrika Eleonora of Sweden (GND 123038162) as spouse.
Governments (1/2 with a precise source)
- GovernmentPending review
King · Sweden · 1720–1751
A precise source has not yet been added. - GovernmentDocumented
Landgrave · Hesse-Kassel · 1730–1751
Landgrave from his father's death in 1730 until his own in 1751; he governed through his brother William as lieutenant.Neue Deutsche Biographie · Friedrich I., Landgraf von Hessen-Kassel, König von Schweden · NDB 5 (1961), pp. 507–508 (Wolf von Both). Landgrave of Hesse-Kassel following his father's death in 1730; his brother William VIII served as lieutenant (Statthalter) of Hesse-Kassel from 1730.Allgemeine Deutsche Biographie · Wilhelm VIII., Landgraf von Hessen-Kassel · ADB 43 (1898), pp. 60–64 (Hugo Brunner). Born in March 1682 and died on 1 February 1760; son of Landgrave Charles. In 1730 his brother, already landgrave, appointed him lieutenant and regent with almost unlimited powers; he governed in this capacity for 21 years until his brother's death in 1751 gave him government in his own right.
Biographical and contextual references (4)
Editorial history
- 2026-10-12 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-10-08 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-10-04 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-10-04 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-10-03 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
- 2026-09-30 · The duchy is limited to Dijon and Autun; each other fief now enters the map only under its dated ruler. John III of Namur and the Nevers/Rethel branch were added. The previous shape combined later counties and unrelated lands as if all belonged to the duchy from 1363.
- 2026-09-28 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
