Ingrid Detter de Frankopan

Thyra Ingrid Hildegard Detter de Frankopan (born 1936)^[1] is a Swedish scholar of international law, Lindhagen Professor Emerita at Stockholm University, a practising barrister, and the author of multiple books.

Detter earned a doctorate in 1962 from the Faculty of Law, University of Oxford; her dissertation was Treaty-making power of international organisations.^[2] She completed another doctorate in 1965 from Stockholm University; her dissertation was Law Making by International Organizations.^[3][4] As of 1988, she was Carl Lindhagen Professor of International Law at Stockholm University, and also held an affiliation with the London School of Economics.^[5]

She was called to the bar in 1977 and is a member of the Three Stone commercial chancery chambers in Lincoln's Inn.^[6]

Detter's books include:

• Law Making by International Organizations (Norstedt, 1965)^[4]
• Essays on the Law of Treaties (Norstedt, 1967)^[7]
• The East African Community and Common Market (Longmans, 1970)^[8]
• Finance and Protection of Investments in Developing Countries (Gower, 1974; 2nd ed., 1987)^[9]
• International Law and the Independent State (Gower, 1974; 2nd ed., 1988)^[10]
• International Adoptions and the Conflict of Laws (Almqvist & Wiksell, 1975)^[11]
• Bibliography of International Law (Bowker, 1975)^[12]
• The Concept of International Law (Norstedt, 1987; 2nd ed., 1995)^[13]
• The Law of War (Cambridge University Press, 1988; 3rd ed., 2017)^[14]
• The International Legal Order (Dartmouth Publishing, 1994)^[15]

Detter married Louis Doimi de Lupis, a Croatian man who later called himself Louis Doimi de Frankopan. Their daughter Paola married Lord Nicholas Windsor of the British royal family, becoming Lady Nicholas Windsor,^[16] and their son Peter Frankopan, a historian and hotelier, married Sainsbury heiress Jessica Sainsbury.^[17]