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7 Tel Aviv U. Stud. L. 9 (1985-1986)
The Grotian Concept of Good Faith

handle is hein.journals/telavusl7 and id is 9 raw text is: THE GROTIAN CONCEPT OF GOOD FAITH

By Haim H. Cohn**
Last year the legal world celebrated the 400th anniversary of the birth
of Huigh de Groot, better known as Hnown as Hugo Grotius (10 April
1583). It might not be accurate to extol this great Dutch jurist as the
founder of modern international law. His famous opus magnum, De iure
belli acpacis, first appeared in 1625: it had been preceded by treatises on
international law by Vitoria,' Ayala,2 Gentilis,3 and Suarez4 - to name
only the most frequently quoted by Grotius. Nor would it be correct to
say that Grotius' work contains a valid statement of positive interna-
tional law even of his time: in fact, it is a curious mixture of moral
theology and legal history, partly an anthological compilation, partly an
inductive juridical composition - and the many contradictory dicta as to
the respective priorities of divine or natural law, or as to what would be
permissible and what would be prohibited in the course of warfare,
render its usefulness as a legal textbook questionable.5 The greater may
the significance be that must attach to some of the principles and postu-
lates which underlie the Grotian edifice: they have not in the course of the
centuries lost anything of their validity and actuality. First and foremost
among them ranks the principle of fides, that is, good faith.
* This article is based on a Paper delivered at the Sixth International Congress of
Jewish Lawyers and Jurists, Good Faith in International and Inter-personal
Relations, held at Jerusalem, August 1984.
** President, International Association of Jewish Lawyers and Jurists; Deputy Presi-
dent Emeritus, Supreme Court of Israel.
1. Francisco de Vitoria (born 1480, Spain): De Indis Recenter Inventis et de Jure Belli
(published posthumously, 1546).
2. Baltasar Ayala (born 1548, Spain): De Jure et Officiis Bellicis et Disciplina Militari
(1582).
3. Alberico Gentili (born 1552, Italy, settled in England 1580): De Jure Belli, Libri
Tres (1598).
4. Francisco Suarez (born 1545, Spain): De Legibus ac Deo Legislatorex (1612).
5. See Lauterpacht, The Grotian Tradition in International Law, in British Year-
book of International Law, vol.23 (1946), translated into Hebrew in Feinberg (ed.),
Studies in Public International Law in Memory of Sir Hersh Lauterpacht (Jerusa-
lem 1961) 9 et seq.

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