The Curtius Baronetcy of Sweden was a title in the Baronetage of England, created on 2 April 1652 for William Curtius. In Germany he was known as Wilhelm von Curti, where from 1654 he resided in Castle Curti in Umstadt, Hesse.
In 1632, in the midst of the Thirty Years' War, Curtius went to the Swedish King campaigning in Germany as secretary to the English ambassador Henry Vane. Curtius then remained in Germany as an Agent of Charles I of England until December 1633. After serving as secretary to King Charles' brother-in-law, Frederick V, Elector Palatine, Curtius was appointed by Charles I as official resident of the English Crown in the Holy Roman Empire. At the time of his appointment to the Baronetcy by Charles II, Curtius was described as "resident for his majesty, with Gustavus, King of Sweden, and the princes of Germany". From 5 August 1664 until September 1677, he was Resident Ambassador at Frankfurt am Main.
On his death in 1678, Sir William was succeeded as Baronet by his son, Sir Charles William Curtius, who lived until 1733. Charles was unsuccessful in his petition to the English Parliament to pay the fees promised Sir William by "Kings Charles the First, and Second".
The baronetcy became extinct with the last male descendant in 1823.
Curtius baronets, of Sweden (1652)
- Sir William Curtius FRS, 1st Baronet (Born Johann Wilhelm di Curti on 12 August 1599 in Bensheim, died 23 January 1678 in Frankfurt am Main).
- Sir Charles (William) Curtius, 2nd Baronet (26 December 1654 – 13 April or September 1733)
- Sir William Curtius in the National Portrait Gallery
- Despatches, letters and papers of Sir William Curtius 1643–1662 , Surrey History Centre
- Heyleyn, Peter (1773), Help to English History: Containing a Succession of All the Kings of England ... the Kings and Princes of Wales; the Kings and Lords of Man: and the Isle of Wight. As Also of All the Dukes, Marquises, Earls and Bishops Thereof ... Together with the Names and Ranks of the Viscounts, Barons, and Baronets, of England, p. 475
- Bell, Gary M. (1995), Handlist of British Diplomatic Representatives, 1509–1688, Cambridge: Cambridge University Press, pp. 146, 274
- Oman, Carola (1938), Elizabeth of Bohemia, London: Hodder and Stoughton Limited, p. 369
- "Fellowship of the Royal Society".
- "House of Commons Journal Volume 10: 3 August 1689". Journal of the House of Commons 10 (1688–1693): 251–252. 1802.
- Curti Castle (de)